Quake PAK file utility
The imaginary eight-bit machine
THIS SOFTWARE IS IN PRE-PRE-PRE-PRE-ALPHA. So don't really download it
Multimedia asset management and manipulator for Étoilé
A world editor for HGE game engine written in python and uses OpenGL.
3D game engine for C and C++
A truly extensible cross-platform game engine
A very small multi-platform game engine for creating desktop games.
An open source skateboard games engine written in C# and .NET.
Pear3DEngine is a modern and modular 3D development framework
An extensible development framework for roleplay games.
Simple Point & Click Game
Make games with Lego-like building blocks