Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Tynker - Game Worlds for Kids to Learn Programming
Blockly - Blockly is a library for building visual programming editors.
CodeCombat - Learn programming with a multiplayer live coding strategy game.
Coin Pusher - Coin Pusher is an Addictive Puzzle game by Coin Unity.
StackHive - Design, develop or publish websites right from your browser