MathCrunch - Learn math stress free
SSHTron - SSHTron is a multiplayer lightcycle game that runs through SSH.
Kalam Labs - Twitch for Science
Snake Rewind - The classic Snake game, re-imagined with super cool graphics, effects and gameplay.
Code Fight Club - A fight club you can talk about. Less punching, more coding.
Nibble Game - Futuristic, rotary version of the classic Snake and Nibbles games.