In 1999, for my Senior Project at University, I built a java shared workspace/chat/whiteboard/videochat type thing. It isn’t the greatest collection of code ever but some of it isn’t too bad. If nothing else I learned a lot working on it.

The project is now indexed in Koders (and has been on sourceforge for a long time) so if you are looking for some ideas or want to much around with the code you can now check it out in detail.