0 A.D. is a free, open-source, cross-platform real-time strategy game.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
A fun realistic multiplayer free-and-open-source first-person-shooter!
3D game engine for C and C++
Game development toolkit
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal
A complete 2D Game Engine with built in drag and drop editor
A DirectX based graphics/physics engine