Blockinger - An open source Tetris clone for Android.
Raspberry Pi - The Raspberry Pi is a tiny and affordable computer that you can use to learn programming through fun, practical projects. Join the global Raspberry Pi community.
NullpoMino - NullpoMino is an open-source action puzzle game that works on the Java platform.
Arduino - Build your own electronics
Good Old Tetris - Play Tetris Online. The game that will never get old.
codebender - The Largest Arduino Playground In The World. Create, share and run your code anywhere.