Hive: First free unlimited cloud service in the world.
GitHub: Build software better, together.
BitBucket: Git and Mercurial code management for teams
Chisel: Chisel offers an unlimited number of fossil repositories.
Visual Studio: Comprehensive collection of developer tools and services.
Landscape: Landscape is an early warning system for your Python codebase.
Swiftype: Add great search to any website. Free with limitations.
Keen.io: Gather all the data you want & start getting the answers you need.
Coveralls: Test coverage history and statistics.
LingoHub: Free for Small Teams, Open Source usage and Educational projects.
Codacy: Continuous Static Analysis designed to complement your unit tests.
Searchcode: Search over 20 billion lines of code.
TinyCert: Free SSL certificates for your startup.
StartSSL: Free SSL certificates.
Opbeat: The first ops platform for developers. Free for small teams.
Pingdom: Website monitoring. Free for one website.
Rollbar: Full-stack error monitoring for all apps in any language.
Loggly: Simplify Log Management Forever. Free for one user.
Devport: Get your developer portfolio.
Getting Real: The smarter way to build web apps. A free book by 37signals.
Peek: Get a free, 5-minute video of someone using your site.
Creator: Build better Ionic apps, faster.
DevFreeCasts: A huge collection of free screencasts for developers.
Cody: A free library of HTML, CSS, JS nuggets.