A multiplatform game engine for interactive fiction experiences
A 3D, fully concurrent game engine
A cross-platform game framework based on OpenGL and GObject.
A retro style video game engine for RPGs and adventure games.
A game development kit for Sifteo Cubes.
2D Game Engine, based on OpenGL and focused on Isometric Games
3D world editor for game development
A very small multi-platform game engine for creating desktop games.
Little game background framework in java.
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.
Open Source Virtual World and MMOG Development Platform