LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
SmallDevTools - Handy developer tools with a delightful interface
Spirit - The animation tool for the web.
GitHub Student Developer Pack - The best developer tools, free for students.
Proximity School of Design - Design school & design pattern library