GraphOX is awesome
Tactical, turn-based game engine, that uses OpenGL and WinAPI
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal
A free Sudoku game
A complete 2D Game Engine with built in drag and drop editor
2D motorcycle simulator done using Lagrangian equations of motion
Free and open source FPS based on Quake III Arena
A DirectX based graphics/physics engine
Simple snake game with classic design
An adaptation of the well-known "Tetris" game.