Odamex is a free, cross-platform, modern client-server Doom engine
A free 3d game for PC that does not limit the player. Fight,Build,Gain
Fast small FPS using JOGL and JOAL
Source code of the chapters of the book 3D Game Development with LWJGL
Oblige is a random level generator for classic FPS games
A Java light, open source first person shooter,with editors.
Zombie survival on a city wide scale!
Complete, Fast, Accurate, Game Boy/CGB/SGB Emulator.
A ridiculous fast-paced fps campaign on the Cube 2 engine
Free and open source FPS based on Quake III Arena