Probably the hardest game ever created, ASOEPT takes you on a journey into the deep of your mind, and offers great rewards for the first person to finish it.
Code for Good (Sponsored by Intel)
Mac OS X
Not totally sure which platforms it works on, but should at least work on Mac. Written in Java.
Download JDK(java development kit) Then go to youtube and search how you build a java program in your Os terminal.
Game by Sebastian Røed Mangseth
Title by Stein Llanos