Open Source Candies
The Free-for-Open-Source Services List
Formerly started at 
YCombinator
[<img src="%favicon_url%" alt="%service_name%" height="16" /> %service_name%](%service_url%) - %description% - %rules%
In alphabetical order, please
BitBucket - free for open source and private repositories
GitHub - free for open source repositories, paid for private repositories
GitLab - free for open source and private repositories
NuGet - free .NET Project Hosting
Python Anywhere - hosting for Python projects - has limits
SourceForge - Git/Mercurial/SVN Project Hosting
DigitalOcean - free credits for eligible open source projects - request needed
OpenShift - free for open source - request needed
GitBook - free for open source - request needed
Continuous Integration and Code Coverage
AppVeyor - Continuous Integration for .NET and many open source languages on Windows
Azure Pipelines - Azure Pipelines offers cloud-hosted pipelines for Linux, macOS, and Windows with unlimited minutes for open source projects.
Bitrise - Continuous Integration for mobile
CircleCI - Continuous Integration and Delivery - 3 extra containers
Codecov - Continuous Code Coverage
Codeship - Continuous Integration and Delivery for several languages, also supports Docker
Coveralls - Code Coverage History
Deploy - Continuous Deployment - email request needed
DeployBot - continuous deployment for GitHub, BitBucket or your own Git/SVN repository - free for one repository
Gitlab-CI - on-premises CI for GitLab - free and open source
JRebel - Instant Deployment for Java
Sauce Labs - CI for GitHub, Google Code, SourceForge with Selenium - free for open source
Scrutinizer - CI for GitHub and BitBucket - free for open source
Semaphore - CI for GitHub and BitBucket - free for open source
Team City - free for open source - strict rules - request needed
Travis CI - CI for GitHub - free for open source
Zutubi Pulse - 1 server, 5 agents, unlimited users - request needed
Browser Stack - Live, Web-Based Browser Testing - request needed
TestingBot - Browser Testing - request needed
Bugsnag - Multilanguage Crossplatform Error Monitoring - free for open source - email request needed
Datadog - Real-time performance monitoring for open source projects - free for open source - request needed
Healthchecks.io - Cron monitoring - free for open source - email request needed
Hund - Hosted Status Pages - free for open source - email request needed
Sentry - 100% Open Source Crash Reporting - forever free for open source - request needed
Codacy - Automated Code Review for Scala, JavaScript, PHP, Python and CSS - free for open source
CodeClimate - Code Review for Ruby, JavaScript, PHP - free for open source
QuantifiedCode - Automated Code Review for Python - free for open source
Landscape - Code quality inspector for Python
Snyk - Continuously find & fix vulnerabilities in your dependencies, supports multiple languages - free for open source and low volume private testing
Crowdin - free for open source - request needed
Launchpad - Localization Platform for open source projects
POEditor - free for open source - request needed
Transifex - Localization Platform for Web
Translation.io - Localization for Rails apps - email request needed
Blackfire - PHP Profiler by creators of Symfony
SensioLabsInsight - Code Quality Assurance Tool by creators of Symfony - free for open source
YourKit - Java Profiler
Helpmonks - Team email management. Simplified. - free for open source projects and non-profit organizations
MailChimp - free for 12,000 emails to 2,000 subscribers
AppCode - Objective C IDE - free for open source, Outercurve developers - strict rules - request needed
IntelliJ Idea - Java IDE - free for non-Apache developers, Apache developers, Outercurve developers - strict rules - request needed
PhpStorm - PHP IDE - free for open source, Outercurve developers - strict rules - request needed
PyCharm - Python IDE - free for open source, Outercurve developers - strict rules - request needed
RubyMine - Ruby IDE - free for open source, Outercurve developers - strict rules - request needed
Visual Studio Community - free, fully-featured IDE for students, open-source and individual developers
WebStorm - JavaScript, CSS, HTML IDE - free for open source, Outercurve developers - strict rules - request needed
HuBoard - Project management for GitHub issues - free for public projects
Taiga.io - Agile project management platform - free for public projects
Teamwork - free for 2 Projects, 10MB Storage
Trello - simple bugtracker - free for all
YouTrack - free for open source - strict rules - request needed
Waffle.io - project management powered by your GitHub issues & pull requests
ZenHub.io - Team collaboration in GitHub - free for public and open source projects
Zulip - Group chat webapp and mobile app - Free hosted instance for open source projects & communities
Cloudflare - free Shared SSL cert for everyone, unmetered DDoS mitigation and Web Application Firewall
GoDaddy - free for one year for open source projects
Let’s Encrypt - free, automated, and open certificate authority
Razuna - Worlds most popular open source Digital Asset Management. 30 days free trial
Canva - free for all plan
Openclipart - Free clipart for all
Unsplash - Photos for free for all purpose - no link back required (although appreciated)
Misc. Application Utilities
Algolia - Hosted Search engine as a service - free for community and open source use, email request needed
Apiary - Design, prototype, document and test APIs - email request needed
Auth0 - Single Sign On & Token Based Authentication - request needed
Cloudflare - Pro Plan upgrade for open source projects, includes CDN, SSL cert, Web Application Firewalls, image and mobile optimizations, and more.
Gelato.io - Developer Portals - email request needed
Mailtrap - Fake SMTP servers - email request needed
https://www.atlassian.com/software/views/open-source-license-request
May contain outdated information
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent