As an Python advocate and educator, I’m always looking for ways to make my job (and yours) easier. This list put together by Morpheus Data offers a ton of great resources for Python users (more than 25 tools specific to Python) and other DevOps and Sysadmins. Enjoy.

Table of Contents

Source Code Repos

Tools for Teams and Collaboration

Code Quality

Code Search and Browsing


Automated Browser Testing

Security and PKI

Management Systems

Log Management

Translation Management


Crash and Exception Handling



CDN and Protection



Web Hosting




STUN, WebRTC, Web Socket Servers and Other Routers

Issue Tracking and Project Management

Storage and Media Processing

Design and UI

Data Visualization on Maps

Package Build System

IDE and Code Editing

Analytics, Events and Statistics

International Mobile Number Verification API and SDK

Payment / Billing Integration

Docker Related

Vagrant Related


APIs, Data, and ML

Other Free Resources

Source Code Repos

bitbucket.org — Free unlimited public and private repos (Git and Mercurial) for up to 5 users

chiselapp.com — Unlimited public and private Fossil repositories

github.com — Free for an unlimited number of public repositories

about.gitlab.com — Unlimited public and private Git repos with unlimited collaborators

hub.jazz.net — Unlimited public repos, private repos free for up to 3 accounts

visualstudio.com — Free unlimited private repos (Git and TFS) for up to 5 users per team

fogcreek.com — Free unlimited public and private repos (hybrid of Git and Mercurial) for 2 users

plasticscm.com — Free for individuals, OSS and nonprofits organizations

cloud.google.com — Free private Git repositories hosted on Google Cloud Platform. Supports syncing with existing GitHub and Bitbucket repos. Free Beta for up to 500 MB of storage

Tools for Teams and Collaboration

scinote.net — scientific data management & team collaboration. One Team with Unlimited number of users, backup and 1GB storage space

appear.in — One click video conversations, for free

flowdock.com — Chat and inbox, free for teams up to 5

slack.com — Free for unlimited users with some feature limitations

hipchat.com — Free for unlimited users with some feature limitations

gitter.im — Chat, for GitHub. Unlimited public & private rooms, free for teams of up to 25

hangouts.google.com — One place for all your Conversations, for free, need a Google account

seafile.com — Private or cloud storage, file sharing, sync, discussions. Private version is full. Cloud version has just 1 GB

sameroom.io — Free for unlimited users with some feature limitations

yammer.com — Private social network standalone or for MS Office 365. Free, just a bit less admin tools and users management features

helpmonks.com — Shared inbox for teams, free for Open Source and nonprofit organizations

typetalk.in — Share and discuss ideas with your team through instant messaging on the web or on your mobile

talky.io — Free group video chat. Anonymous. Peer‑to‑peer. No plugins, signup, or payment required

sourcetalk.net — Code discussion tool, free for open code talks

helplightning.com — Help over video with augmented reality. Free without analytics, encryption, support

evernote.com — Tool for organizing information. Share your notes and work together with others

wunderlist.com — Share your lists and work collaboratively on projects with your colleagues, free on iPhone, iPad, Mac, Android, Windows and the web

doodle.com — The scheduling tool you’ll actually use. Find a date for a meeting two times faster

sendtoinc.com — Share links, notes, files and have discussions. Free for 3 and 100 MB

zoom.us — Secure Video and Web conferencing, add-ons available. Free limited to 40 minutes

ideascale.com — Allow clients to submit ideas and vote, free for 25 members in 1 community

filehero.io — Make it easy to access your company’s file storage from a corporate download page. Free for 5 concurrent downloads

wistia.com — Video hosting with viewer analytics, HD video delivery, and marketing tools to help understand your visitors, 25 videos and Wistia branded player

cnverg.com — Real-time shared visual workspace, whiteboard, GitHub integration. Free 5 GB, 5 spaces and 5 collaborators, no GitHub repos

Code Quality

tachikoma.io — Dependency Update for Ruby, Node.js, Perl projects, free for Open Source

gemnasium.com — Dependency Update for Ruby, Node.js projects, free for Open Source

deppbot.com — Automated Dependency Updates for Ruby projects, free for Open Source

landscape.io — Code Quality for Python projects, free for Open Source

codeclimate.com — Automated code review, free for Open Source

houndci.com — Comments on GitHub commits about code quality, free for Open Source

coveralls.io — Display test coverage reports, free for Open Source

scrutinizer-ci.com — Continuous inspection platform, free for Open Source

codecov.io — Code coverage tool (SaaS), free for Open Source

insight.sensiolabs.com — Code Quality for PHP/Symfony projects, free for Open Source

codacy.com — Automated code reviews for PHP, Python, Ruby, Java, JavaScript, Scala, CSS and CoffeeScript, free for Open Source

pullreview.com — Automated Code Review for Ruby in GitHub, Bitbucket and GitLab, free for Open Source

gocover.io — Code coverage for any Go package

goreportcard.com/ — Code Quality for Go projects, free for Open Source

inch-ci.org — Documentation badges for Ruby, JS and Elixir

scan.coverity.com — Static code analysis for Java, C/C++, C# and JavaScript, free for Open Source

webceo.com — SEO tools but with also code verifications and different type of advices

zoompf.com — Fix the performance of your web sites, detailed analysis

websitetest.com — Yotta’s tool to optimize web sites, free limited version online

gtmetrix.com — Reports and thorough recommendations to optimize websites

browserling.com — Live interactive cross-browser testing, free only 3 min. sessions with MS IE 9 under Vista at 1024 x 768 resolution

loadfocus.com — Load and speed tests for websites, mobile apps and APIs, monitoring,… Free 5 tests/month, 120 clients/test, 1 monitor, 1 location,…

versioneye.com — Monitor your source code and notify about outdated dependencies. Free for Open Source and public repos

beanstalkapp.com — A complete workflow to write, review & deploy code), free account for 1 user and 1 repository, with 100 MB of storage

testanywhere.co — Automatic test website or web app continuously and catch bugs in the early stages, free 1,000 tests/month

srcclr.com — SourceClear to scan source code for vulnerabilities, multi-languages and OS

Code Search and Browsing

sourcegraph.com — Java, Go, Python, Node.js, etc., code search/cross-references, free for Open Source

searchcode.com — Comprehensive text-based code search, free for Open Source


codeship.com — 100 private builds/month, 5 private projects, unlimited for Open Source

circleci.com — Free for one concurrent build

travis-ci.org — Free for public GitHub repositories

wercker.com — Free for public and private repositories

drone.io — CI platform that includes browser testing, free for Open Source

semaphoreci.com — 100 private builds/month, unlimited for Open Source

shippable.com — Free for 1 build container, private and public repos, unlimited builds

snap-ci.com — Free for public repositories, 1 build at the time

appveyor.com — CD service for Windows, free for Open Source

github.com — Comparison of Continuous Integration services

ftploy.com — 1 project with unlimited deployments

deployhq.com — 1 project with 10 daily deployments

hub.jazz.net — 60 minutes of free build time/month

styleci.io — Public GitHub repositories only

bitrise.io — iOS CI/CD with 200 free builds/month

saucelabs.com — CI with scalable testing for mobile and web apps, free for Open Source

buddybuild.com — Build, deploy and gather feedback for your iOS and Android apps in one seamless, iterative system.

Automated Browser Testing

gridlastic.com — Selenium Grid testing with free plan up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes per month

browserstack.com — Manual and automated browser testing, free for Open Source

EveryStep-Automation.com — Records and replays all steps made in a web browser and creates scripts,… free with fewer options

Security and PKI

threatconnect.com — Threat intelligence: It is designed for individual researchers, analysts, and organizations who are starting to learn about cyber threat intelligence. Free upto 3 Users

crypteron.com — Cloud-first, developer-friendly security platform prevents data breaches in .NET and Java applications

snyk.io — Snyk found and reported several vulnerabilities in the package.Limited to 1 private project (unlimited for open source projects)

vaddy.net — Continuous web security testing with continuous integration (CI) tools. 3 domains, 10 scans history for free

letsencrypt.org — Free SSL Certificate Authority with certs trusted by all major browsers

globalsign.com — Free SSL certificates for Open Source

startssl.com — Free SSL certs

wosign.com — Free SSL certs. Up to 5 domain names for 2 years period. China authority

soclall.com — Free up to 1,000 users login, post, share through top 20+ social networks

stormpath.com — Free user management, authentication, social login, and SSO

auth0.com — Hosted free for development SSO

getclef.com — New take on auth unlimited free tier for anyone not using premium features

ringcaptcha.com — Tools to use phone number as id, available for free

ssllabs.com — Very deep analysis of the configuration of any SSL web server

qualys.com — Find web app vulnerabilities, audit for OWASP Risks

alienvault.com — Uncovers compromised systems in your network

duo.com — Two-factor authentication (2FA) for website or app. Free 10 users, all authentication methods, unlimited, integrations, hardware tokens

tinfoilsecurity.com — Automated vulnerability scanning. Free plan allows weekly XSS scans

acunetix.com — Free vulnerability and network scanning for 3 targets

ponycheckup.com — An automated security checkup tool for Django websites

foxpass.com — Hosted LDAP and RADIUS. Easy per-user logins to servers, VPNs, and wireless networks. Free for 10 users

opswatgears.com — Security Monitoring of computers, devices, applications, configurations,… Free 25 users and 30 days history

bitninja.io — Botnet protection through a blacklist, free plan only reports limited information on each attack

onelogin.com — Identity as a Service (IDaaS), Single Sign-On Identity Provider, Cloud SSO IdP, 3 company apps and 5 personal apps, unlimited users

logintc.com — Two-factor authentication (2FA) by push notifications, free for 10 users, VPN, Websites and SSH

report-uri.io — CSP and HPKP violation reporting

Management System

bitnami.com — Deploy prepared apps on IaaS. Management of 1 AWS micro instance free

visualops.io — 3,600 instance hours/month free

Log Management

papertrailapp.com — 48 hours search, 7 days archive, 100 MB/month

logentries.com — Free up to 5 GB/month with 7 days retention

loggly.com — Free for a single user, see the lite option

sematext.com — Free up to 500 MB/day, 7 days retention

sumologic.com — Free up to 500 MB/day, 7 days retention

logz.io — Free up to 1 GB/day, 3 days retention

Translation Management

lingohub.com — Free up to 3 users, always free for Open Source

getlocalization.com — Free for public projects

webtranslateit.com — Free up to 500 strings

transifex.com — Free for Open Source

oneskyapp.com — Limited free edition for up to 5 users, free for Open Source

crowdin.com — Unlimited projects, unlimited strings and collaborators for Open Source


opbeat.com — Instant performance insights for JS developers. Free with 24 hours data retention

checkmy.ws — Free 15 days full demo and 3 websites, forever free for Open Source

appneta.com — Free with 1 hour data retention

thousandeyes.com — Network and user experience monitoring. 3 locations, plus 20 data feeds of major web services free

datadoghq.com — Free for up to 5 nodes

stackdriver.com — Free monitoring up to 10 servers/hosted services

keymetrics.io — Free for 2 servers with 7 days data retention

newrelic.com — Free with 24 hours data retention

nodequery.com — Free basic server monitor up to 10 servers

watchsumo.com — Free website monitoring, 50 Http(s), Ping or keywords, every 5+ minutes

opsgenie.com — Alert management with mobile push. 600 free alerts/month for 2 users

runscope.com — Monitor and log API usage. Single user 25,000 requests/month free

circonus.com — Free for 20 metrics

uptimerobot.com — Website monitoring, 50 monitors free

statuscake.com — Website monitoring, unlimited tests free with limitations

bmc.com — Free 1 second resolution for up to 10 servers

ghostinspector.com — Free website and web application monitoring. Single user, 100 test runs/month

java-monitor.com — Free monitoring of JVM’s and uptime

sematext.com — Free for 24 hours metrics, unlimited number of servers, 10 custom metrics, 500 K custom metrics data points, unlimited dashboards, users, etc

sealion.com — Free up to 2 servers, 3 days data retention, graphs and raw command output history (top, ps, ifconfig, netstat, iostat, free, custom, etc.)

stathat.com — Get started with 10 stats for free, no expiration

skylight.io — Free for first 100 K requests (Rails only)

appdynamics.com — Free for 24 hours metrics, application performance management agents limited to one Java, one .NET, one PHP, and one Node.js

deadmanssnitch.com — Monitoring for cron jobs. 1 free snitch (monitor), more if you refer others to sign up

librato.com — Free up to 100 metrics at 60 seconds resolution

freeboard.io — Free for public projects. Dashboards for your Internet of Things projects

loader.io — Free load testing tools with limitations

speedchecker.xyz — Performance Monitoring API, checks Ping, DNS, etc

blackfire.io — Blackfire is the SaaS-delivered Application Performance Solution. Free Hacker plan (PHP Only)

apimetrics.io — Automated API Performance Monitoring, Testing and Analytics. Free Plan, manually make API calls and Run from their West Coast servers

opsdash.com — Self-hoster server, clusters and services monitoring, free for 5 servers and 5 services

Crash and Exception Handling

rollbar.com — Exception and error monitoring, free plan with 5,000 errors/month, unlimited users, 30 days retention

bugsnag.com — Free for up to 2,000 errors/month after the initial trial

getsentry.com — Sentry tracks app exceptions in realtime, has a small free plan. Free, unrestricted use if self-hosted


algolia.com — Hosted search-as-you-type (instant). Free hacker plan up to 10,000 documents and 100,000 operations. Bigger free plans available for community/Open Source projects

swiftype.com — Hosted search solution (API and crawler). Free for a single search engine with up to 1,000 documents. Free upgrade to Premium level for Open Source

bonsai.io — Free 1 GB memory and 1 GB storage

searchly.com — Free 2 indices and 5 MB storage

facetflow.com — Hosted Elasticsearch for Microsoft Azure. Free 5,000 docs and 500 MB

indexisto.com — Site search reinvented. Free 10 million document index limit with advertisement block


mailinator.com — Mailinator is Free, Public, Email system where you can use ANY inbox you want! … Disposable Email.

sparkpost.com — First 100,000 emails/month are free

mailgun.com — First 10,000 emails/month are free

tinyletter.com — 5,000 subscribers/month are free

mailchimp.com — 2,000 subscribers and 12,000 emails/month are free

sendloop.com — 2,000 subscribers and 10,000 emails/month are free

sendgrid.com — 400 emails/day for free and 25,000 free transactional emails/month for emails sent from a Google compute instance or Microsoft Azure App Service

phplist.com — Hosted version allow 300 emails/month for free

mailjet.com — 6,000 emails/month for free

sendinblue.com — 9,000 emails/month for free

mailtrap.io — Fake SMTP server for development, free plan with 1 inbox, 50 messages, no team member, 2 emails/second, no forward rules

mailstache.io — 4 mailboxes with 1 GB each for up to 2 custom domains

postmarkapp.com — First 25,000 emails are free

zoho.com — Free email management and collaboration for up to 10 users

domain.yandex.com — Free email and DNS hosting for up to 1,000 users

pawnmail.com — 2 GB free email hosting across unlimited users for custom domain. Roundcube webmail, POP3, IMAP, and SMTP access. No paid plans or upgrades

moosend.com — Mailing list management service. Free account for 6 months for startups

debugmail.io — Easy to use testing mail server for developers

mailinator.com – Free public email for testing accounts

mailboxlayer.com — Email validation and verification JSON API for developers. 1,000 free API requests/month

mailcatcher.me — Catches mail and serves it through a web interface

yopmail.fr — Disposable email addresses

kickbox.io — Verify 100 emails free, real time API available

inumbo.com — SMTP based spam filter, free for 10 users

biz.mail.ru — 5,000 mailboxes with 25 GB each per custom domain with DNS hosting

maildocker.com — First 10,000 emails/month are free

sendpulse.com — 50 emails free/hour, first 12,000 emails/month are free

pepipost.com — Unlimited emails free for first three months, then first 25,000 emails/month are free

CDN and Protection

kloudsec.com — Minimal CDN platform targeted at programmers. CDN is free. Optional and free plugins include Page Optimization (Pagespeed), Service Doctor (Website performance analytics and alerts) and One-click Encryption (Auto provision/renew LetsEncrypt certs for HTTPS)

cloudflare.com — Basic service is free, good for a blog, Cloudflare also offers a free SSL certificate service

bootstrapcdn.com — CDN for bootstrap, bootswatch and font awesome

surge.sh — Single–command, bring your own source control web publishing CDN

cdnjs.com — CDN for JavaScript libraries, CSS libraries, SWF, images, etc

jsdelivr.com — Super-fast CDN of OSS (JS, CSS, fonts) for developers and webmasters, accepts PRs to add more

developers.google.com — The Google Hosted Libraries is a content distribution network for the most popular, Open Source JavaScript libraries

asp.net — The Microsoft Ajax CDN hosts popular third party JavaScript libraries such as jQuery and enables you to easily add them to your Web application

toranproxy.com — Proxy for Packagist and GitHub. Never fail CD. Free for personal use, 1 developer, no support

rawgit.com — Free limited traffic, serves raw files directly from GitHub with proper Content-Type headers

incapsula.com — Free CDN and DDoS protection

fastly.com — Free CDN, all features until USD 50/month is reached, enough for most, then pay or suspended

athenalayer.com — Free DDoS protection with unlimited websites

section.io — A simple way to spin up and manage a complete Varnish Cache solution. Supposedly free forever for one site

netdepot.com — First 100 GB free/month

dropigee.com — Dropigee provides CDN + Cloud Storage, get 2 GB of bandwidth and unlimited storage free per month


cloud.google.com — Google App Engine gives 28 instance hours/day free, 1 GB NoSQL database and more

engineyard.com — Engine Yard provides 500 free hours

azure.microsoft.com — MS Azure gives USD 200 worth of free usage for a trial

appharbor.com — A .Net PaaS that provides 1 free worker

shellycloud.com — Platform for hosting Ruby and Ruby on Rails apps, €20 of free credit

heroku.com — Host your apps in the cloud, free for single process apps

firebase.com — Build realtime apps, free plan has 100 max. connections, 10 GB data transfer, 1 GB data storage, 1 GB hosting storage and 10 GB hosting transfer

bluemix.net — IBM PaaS with a monthly free allowance

openshift.com — Red Hat PaaS, free tier provides three small gears each with 512 MB memory and 1 GB storage. {Browse one-click deployments}

outsystems.com — Enterprise web development PaaS for on-premise or cloud, free “personal environment” offering allows for unlimited code and up to 1 GB database

platform.telerik.com — Build and deploy mobile applications using JavaScript. Free plan has 100 MB data storage, 1 GB file storage, 5 GB bandwidth, 1 million push notifications for BaaS offering, 100 active devices for analytics

scn.sap.com — The in-memory Platform-as-a-Service offering from SAP. Free developer accounts come with 1 GB structured, 1 GB unstructured, 1 GB of Git data and allow you to run HTML5, Java and HANA XS apps

mendix.com — Rapid Application Development for Enterprises, unlimited number of free sandbox environments supporting 10 users, 100 MB of files and 100 MB database storage each

pythonanywhere.com — Cloud Python app hosting. Beginner account is free, 1 Python web application at your-username.pythonanywhere.com domain, 512 MB private file storage, one MySQL database

configure.it — Mobile app development platform, free for 2 projects, limited features but no resource limits

elastx.com — Free tier with up to 4 cloudlets, must be renewed every year

pagodabox.io — Small worker, web server, cache, and database for free

cloudandheat.com — 128 MB of RAM for free, includes support for custom domains for free

zeit.co/now – Managed platform for Node.js deployments, featuring dynamic realtime scaling. Includes 20 free deploys/month limited to 1GB storage and 1GB bandwidth for OSS projects (source files are exposed on a public URL)

sandstorm.io – Sandstorm is an open source operating system for personal and private clouds. Free plan offers 200MB storage and 5 grains free.


apigee.com — Unlimited trial includes NoSQL data store with 25 GB of storage, user and permission management, geolocation, 10 million push notifications/month, remote configuration, beta and A/B split testing, APM, fully API driven. Accessible and manageable via UI, SDK, and API

appacitive.com — Mobile backend, free for the first 3 months with 100 K API calls, push notifications

bip.io — A web-automation platform for easily connecting web services. Fully open GPLv3 to power the backend of your Open Source project. Commercial OEM License available

blockspring.com — Cloud functions. Free for 5 million runs/month

kinvey.com — Mobile backend, starter plan has unlimited requests/second, with 2 GB of data storage, as well as push notifications for up 5 million unique recipients. Enterprise application support

konacloud.io — Web and Mobile Backend as a Service, with 5 GB free account

layer.com — The full-stack building block for communications

quickblox.com — A communication backend for instant messaging, video and voice calling, and push notifications

pushbots.com — Push notification service. Free for up to 1.5 million pushes/month

dreamfactory.com — DreamFactory is an Open Source backend platform that provides all of the RESTful services you need to build fantastic mobile and web applications

onesignal.com — Unlimited free push notifications

getstream.io — Build scalable news feeds and activity streams in a few hours instead of weeks, free for 3 million feed updates/month

tyk.io — API management with authentication, quotas, monitoring, and analytics. Free cloud offering

iron.io — Async task processing (like AWS Lambda) with free tier and 1 month free trial

stackhut.com — Async task processing (like AWS Lambda). 10 free private services and unlimited free public services

pubnub.com — Free push notifications for up to 1 million messages/month and 100 active daily devices

webtask.io — Run code with an HTTP call. No provisioning. No deployment

zapier.com — Connect the apps you use, to automate tasks. 5 zaps, every 15 min. and 100 tasks/month

stackstorm.com — Event-driven automation for apps, services and workflows, free without flow, access control, LDAP,…

simperium.com — Move data everywhere instantly and automatically, multi-platform, unlimited sending and storage of structured data, max. 2,500 users/month

stamplay.com — Connect services together with a visual interface. 50 K API calls, 100 GB data transfer, and 1 GB storage for free

Web Hosting

closeheat.com — Development Environment in the Cloud for Static Websites with Free Hosting and GitHub integration. 1 free website with custom domain support

code.fosshub.com — is a free service offered by FossHub. Free hosting for Open Source projects.

sourceforge.net — Find, Create, and Publish Open Source software for free

simplybuilt.com — SimplyBuilt offers free website building and hosting for {Open Source projects}. Simple alternative to GitHub Pages

devport.co — Turn GitHub projects, apps, and websites into a personal developer portfolio

netlify.com — Builds, deploy and hosts static site or app, free for 100 MB data and 1 GB bandwidth

pantheon.io — Drupal and WordPress hosting, automated DevOps, and scalable infrastructure. Free for developers and agencies

acquia.com — Hosting for Drupal sites. Free tier for developers. Free development tools (such as Acquia Dev Desktop) also available

bitballoon.com — BitBalloon offers hosting for static sites and apps. Free on a subdomain

readthedocs.org — Free documentation hosting with versioning, PDF generation and more

bubble.is — Visual programming to build web and mobile apps without code, free 100 visitors/month, 2 apps

contentful.com — Content as a Service. Content management and delivery APIs in the cloud. 3 users, 3 spaces (repositories) and 100,000 API requests/month for free

tilda.cc — One site, 50 pages, 50 MB storage, only the main pre-defined blocks among 170+ available, no fonts, no favicon and no custom domain

pubstorm.com — Free static content hosting with global CDN and custom domain support. 10 free sites, each with 2 past revisions


freedns.afraid.org — Free DNS hosting

dns.he.net — Free DNS hosting service with Dynamic DNS Support

luadns.com — Free DNS hosting, 3 domains, all features with reasonable limits

domain.yandex.com — Free email and DNS hosting for up to 1,000 users

selectel.com – Free DNS hosting, anycast, 10 geo zones

cloudns.net — Free DNS hosting up to 3 domains with unlimited records

ns1.com — Data Driven DNS, automatic traffic management, 1 million free queries


aws.amazon.com — AWS Free Tier, free for 12 months

exoscale.ch — Free resources for Open Source

developer.rackspace.com — Rackspace Cloud gives USD 50/month for 12 months

cloud.google.com/compute — Google Compute Engine gives USD 300 over 60 days

virtzone.net — Free VPS. You must meet certain minor qualifications

backblaze.com – Backblaze B2 cloud storage. Free 10GB (Amazon S3-like) object storage for unlimited time


cloudant.com — Hosted database from IBM, free if usage is below USD 50/month

orchestrate.io — 1 application free

redislabs.com — Redis as a Service, 30 MB and 30 concurrent connections free

backand.com — Back-end as a service for AngularJS

zenginehq.com — Build business workflow apps in minutes, free for single users

redsmin.com — Online real-time monitoring and administration service for Redis, 1 Redis instance free

graphstory.com — GraphStory offers Neo4j (a Graph Database) as a service

elephantsql.com — PostgreSQL as a service, 20 MB free

graphenedb.com — Neo4j as a service, up to 1,000 nodes and 10,000 relations free

mongolab.com — MongoDB as a service, 500 MB free

scalingo.com — Primarily a PaaS but offers a 512 MB free tier of MySQL, PostgreSQL, or MongoDB

skyvia.com — Cloud Data Platform, offers free tier and all plans are completely free while in beta

airtable.com — Looks like a spreadsheet, but it’s a relational database, unlimited bases, 1,200 rows/base and 1,000 API requests/month

fieldbook.com — Fieldbook lets anyone create a simple tracking database, as easily as a spreadsheet. Automatic API. Unlimited free sheets, share with unlimited users

iriscouch.com — CouchDB as a service. Free for developing, prototyping, etc

STUN, WebRTC, Web Socket Servers and Other Routers

pusher.com — Hosted Web Sockets broker. Free for up to 20 simultaneous connections and 100 K messages/day

stun:stun.l.google.com:19302 — Google STUN

stun:global.stun.twilio.com:3478?transport=udp — Twilio STUN

segment.com — Hub to translate and route events to other third party services. 100 K events/month free

ngrok.com — Expose locally running servers over a tunnel to a public URL

cloudamqp.com — RabbitMQ as a Service. Little Lemur plan: max 1 million messages/month, max 20 concurrent connections, max 100 queues, max 10,000 queued messages, multiple nodes in different AZ’s

Issue Tracking and Project Management

bitrix24.com — Free intranet and project management tool

pivotaltracker.com — Pivotal Tracker, free for public projects

atlassian.com — Free Jira etc for Open Source

kanbantool.com — Kanban board based project management. Free, paid plans with more options

kanbanflow.com — Board based project management. Free, premium version with more options

kanbanery.com — Board based project management. Free for 2 users, premium tiers with more options

zenhub.io — The only project management solution inside GitHub. Free for public repos, OSS, and nonprofits organizations

trello.com — Board based project management. Free

producteev.com — Task management tool. Free, premium version with more options. Mobile applications available

fogcreek.com — Bug tracking and project management. Free for 2 users

waffle.io — Board based project management solution from your existing GitHub Issues, free for Open Source

huboard.com — Instant project management for your GitHub issues, free for Open Source

taiga.io — Project management platform for startups and agile developers, free for Open Source

jetbrains.com — Free hosted YouTrack (InCloud) for FOSS projects, private projects {free for 10 users}

github.com — In addition to its Git storage facility, GitHub offers basic issue tracking

asana.com — Free for private project with collaborators

acunote.com — Free project management and SCRUM software for up to 5 team members

gliffy.com — Online diagrams: flowchart, UML, wireframe,… Also plugins for Jira & Confluence. 5 diagrams and 2 MB free

cacoo.com — Online diagrams in real time: flowchart, UML, network. Free max. 15 users/diagram, 25 sheets

draw.io — Online diagrams stored locally, in Google Drive, OneDrive or Dropbox. Free for all features and storage levels

hub.jazz.net — IBM Bluemix’s project management services. Free for public projects, free for up to 3 users for private projects

leankit.com — Kanban board, that visualizes your workflow. Free up to 10 users

visualstudio.com — Unlimited free private code repositories; Tracks bugs, work items, feedback and more

testlio.com — Issue tracking, test management and beta testing platform. Free for private use

vivifyscrum.com — Free tool for Agile project management. Scrum Compatible

targetprocess.com — Visual project management, from Kanban and Scrum to almost any operational process. Free for unlimited users, up to 1,000 data entities {more details}

overv.io — Agile project management for teams who love GitHub

taskulu.com — Role based project management. Free up to 5 users. Integration with GitHub/Trello/Dropbox/Google Drive

contriber.com — Customizable project management platform, free starter plan, 5 workspaces

planitpoker.com — Free online planning poker (estimation tool)

Storage and Media Processing

aerofs.com — P2P file syncing, free for up to 30 users

bintray.com — Binary File storage, free for Open Source. Includes SSL, CDN and a limited number of REST calls

cloudinary.com — Image upload, powerful manipulations, storage, and delivery for sites and apps, with libraries for Ruby, Python, Java, PHP, Objective-C and more. Perpetual free tier includes 7,500 images/month, 2 GB storage, 5 GB bandwidth

plot.ly — Graph and share your data. Free tier includes unlimited public files and 10 private files

transloadit.com — Handles file uploads & encoding of video, audio, images, documents. Free for Open Source & other do-gooders. Commercial applications get one GB free for test driving

podio.com — You can use Podio with a team of up to five people and try out the features of the Basic Plan, except users management

shrinkray.io — Free image optimization of GitHub repos

imagefly.io — Responsive images on-demand. CDN fronted image resizing, transcoding, and optimizing. 100 MB/month for free

kraken.io — Image optimization for website performance as a service, free plan up to 1 MB file size

placehold.it — A quick and simple image placeholder service

placekitten.com — A quick and simple service for getting pictures of kittens for use as placeholders

placepenguin.com — A quick and simple service for placeholder images of penguins

embed.ly — Provides APIs for embedding media in a webpage, responsive image scaling, extracting elements from a webpage. Free for up to 5,000 URLs/month at 15 requests/second

backhub.co — Backup and archive your GitHub repositories. Free for public repos

otixo.com — Encrypt, share, copy and move all your cloud storage files from one place. Basic plan provides unlimited files transfer with 250 MB max. file size and allows 5 encrypted files

tinypng.com — API to compress and resize PNG and JPEG images, offers 500 compressions for free each month

filestack.com — File picker, transform and deliver, free for 250 files, 500 transformations and 3 GB bandwidth

packagecloud.io – Hosted Package Repositories for YUM, APT, RubyGem, and PyPI. Limited free plans, open source plans available via request.

Design and UI

pixlr.com — Free online browser editor on the level of commercial ones

imagebin.ca — Pastebin for images

cloudconvert.com — Convert anything to anything. 208 supported formats including videos to gif

resizeappicon.com — A simple service to resize and manage your app icons

vectr.com — Free Design App For Web + Desktop

walkme.com — Enterprise Class Guidance and Engagement Platform, free plan 3 walk-thrus up to 5 steps/walk

marvelapp.com — Design, prototyping and collaboration, free limited for 3 projects

Data Visualization on Maps

geocoder.opencagedata.com/ — Geocoding API that aggregates OpenStreetMap and other open geo sources. 2,500 free queries/day

datamaps.co a free platform for creating visualizations with data maps.

geocod.io — Geocoding via API or CSV Upload. 2,500 free queries/day

gogeo.io — Maps and geospatial services with an easy to use API and support for big data

cartodb.com — Create maps and geospatial APIs from your data and public data

giscloud.com — Visualize, analyze and share geo data online

latlon.io — Geocoding API + school districts, census geography divisons, and other address based data. 2,500 free requests/month

mapbox.com — Maps, geospatial services, and SDKs for displaying map data

Package Build System

build.opensuse.org — Package build service for multiple distros (SUSE, EL, Fedora, Debian etc.)

copr.fedoraproject.org — Mock-based RPM build service for Fedora and EL

help.launchpad.net — Ubuntu and Debian build service

IDE and Code Editing

c9.io — IDE in a browser. Incorporates an Ubuntu virtual machine and in-browser terminal access. Integrates with GitHub and BitBucket, but also adds SFTP and generic Git access

koding.com – online cloud-based development environment. You have a Ubuntu OS machine

codeanywhere.com — Full IDE in the browser and mobile apps. Access FTP, SFTP, Dropbox, Google Drive, GitHub, and BitBucket. Hosted virtual machines with terminal access. Collaboration features like share links, live editing, permissions, and version tracking

codenvy.com — IDE and automated developer workspaces in a browser, collaborative, Git/SVN integration, build and run your app in customizable Docker-based runners (free tier includes: 4 GB RAM, always-on machines, ability to run multiple machines simultaneously), pre-integrated deploy to Google Apps

nitrous.io — Private Linux instance(s) with interactive collaboration, free for 2 hours/day. {More Details}

visualstudio.com — Fully-featured IDE with thousands of extensions, cross-platform app development (Microsoft extensions available for download for iOS and Android), desktop, web and cloud development, multi-language support (C#, C++, JavaScript, Python, PHP and more)

code.visualstudio.com — Build and debug modern web and cloud applications. Code is free, Open Source and available on your favorite platform, Linux, Mac OSX and Windows

cloud.sagemath.com — Collaborative mathematics-oriented IDE in a browser, with support for Python, LaTeX, IPython Notebooks, etc

wakatime.com — Quantified self metrics about your coding activity, using text editor plugins, limited plan for free

apiary.io — Collaborative design API with instant API mock and generated documentation (Free for unlimited API blueprints and unlimited user with one admin account and hosted documentation)

mockable.io — Mockable is a simple configurable service to mock out RESTful API or SOAP web-services. This online service allows you to quickly define REST API or SOAP endpoints and have them return JSON or XML data

jetbrains.com — Productivity tools, IDEs and deploy tools. Free license for students, teachers, Open Source, and user groups

stackhive.com — Cloud based IDE in browser that supports HTML5/CSS3/jQuery/Bootstrap

tadpoledb.com — IDE in browser Database tool. Support Amazon RDS, Apache Hive, Apache Tajo, CUBRID, MariaDB, MySQL, Oracle, SQLite, MSSQL, PostgreSQL and MongoDB databases

sourcelair.com — In-browser IDE for Django, JavaScript, HTML5, Python, and more. Integrates with Git, Mercurial, GitHub, Heroku and more. Free forever for 1 private project

codepen.io — CodePen is a playground for the front end side of the web

Analytics, Events and Statistics

analytics.google.com — Google Analytics

heapanalytics.com — Automatically captures every user action in iOS or web apps. Free for up to 5,000 visits/month

sematext.com — Free for up to 50 K actions/month, 1 day data retention, unlimited dashboards, users, etc

usabilityhub.com — Test designs and mockups on real people, track visitors. Free for one user, unlimited tests

gosquared.com — Track up to 1,000 data points for free

mixpanel.com — Free 25,000 points or 200,000 with their badge on your site

amplitude.com — 1 million monthly events, up to 2 apps

keen.io — Custom Analytics for data collection, analysis and visualization. 50,000 events/month free

inspectlet.com — 100 sessions/month free for 1 website

mousestats.com — 100 sessions/month free for 1 website

metrica.yandex.com — Unlimited free analytics

hotjar.com — Per site: 2,000 pages views/day, 3 heatmaps, data stored for 3 months,…

imprace.com — Landing page analysis with suggestions to improve bounce rates. Free for 5 landing pages/domain

baremetrics.com — Analytics & Insights for stripe

optimizely.com — A/B Testing solution, free starter plan, 1 website, 1 iOS and 1 Android app

expensify.com — Expense reporting, free personal reporting approval workflow

ironSource atom — Atom Data Flow Management is a data pipeline solution, 10M monthly events free

botan.io — Free analytics for your Telegram bot.

International Mobile Number Verification API and SDK

cognalys.com — Freemium mobile number verification through an innovative and reliable method than using SMS gateway. Free accounts will have 10 tries and 15 verifications/day.

numverify.com — Global phone number validation & lookup JSON API. 250 API requests/month

sumome.com — Heat map and conversion enhancement tools, free without few advanced features

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