A Simple Game Engine
A TBS game written in C++ but the twist is its only console based.
OPEN Source Sonic Sokoban
A fork resurrecting NewWolf (Wolfenstein 3D for OpenGL on Windows)
Open Source Virtual World and MMOG Development Platform
A cross-platform «Boulder Dash»-like game in Oberon/Component Pascal
Reference implementation for the Doom game engine.
This game is a 2d arcade game. You can move, jump, kill monster.