Tynker - Game Worlds for Kids to Learn Programming
Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.
CodeCombat - Learn programming with a multiplayer live coding strategy game.
Y Window System - Y Window System is a platform that allows you to improve the speed, working, and efficiency of the application in your operating system and helps you to increase the responsiveness of applications similar to any locally based app.
StackHive - Design, develop or publish websites right from your browser
XQuartz - The XQuartz project is an open-source effort to develop a version of the X.