MonoGame - Take your games to new places.
MonoGame is an opensource XNA 4.0 implementation for iPhone, iPad, Mac, Windows, Linux, Android and Windows 8 Metro.
http://www.monogame.net
Games in this video are
Catapult Wars - XNA Sample
Net Rumble - XNA Sample
Bastion (http://www.supergiantgames.com)
ARMED! (http://armedgame.com)
Music by Ascorbius ( / ascorbius )