Nexuiz is an open-source, multiplayer FPS game, I've worked on and off for the last few years. To be more exact I've joined the team called "Alientrap" sometime in September, 2003 and I'm still working on the project now and then.
It was my first bigger project where I was part of a team of dedicated game developers and I've certainly learnt a lot from working with them on it.
The game uses as majorly changed Quake1 engine called Darkplaces, written by our lead coder and master of wisdom, Forest 'LordHavoc' Hale.
My assignments were supposed to be about everything, but time has showed them to be the engine's base systems, the virtual machine(VM) and the menu code. I've also worked on and debugged the compiler that we used for generating the bytecode the VM interprets, FTEQCC.
This said, let me list the exact things I did (minor stuff excluded):
If someone wants a more detailed explanation of my work on it, I can only suggest reading the stories and tales about it.