Open source online test software

Testa OTMS from sourceforge.

3D slime football

again another simple game that one could make.

3D pong

with the ability to spin the ball for added fun.

smplayer global shortcuts

desperately needs it for playing music.

mini lyrics

An opensource version of minilyrics with an online accompanying wiki from which lyrics can be read and uploaded to.
Furthermore translation from online sources could be nice, either word by word or line by line.
Possibly opens a port to receive commands.

Qlearning to control characters in a game.

usually when we press a key in a computer game, a predefined action takes place. Instead of this we can use Q-learning to Co-evolve the actions that takes place with each key being pressed.

Online video chat.

Come in, enter a name, pick your friends name and voila, you're video chatting, peer to peer with no central server.
It's online it's quick and it's probably in Java.
mebeam seems to do the trick already, I wonder if its fully peer to peer.