2D Game Engine, based on OpenGL and focused on Isometric Games
3D game engine for C and C++
Extremely simple joystick rumble / vibration library
Open source network game service
Scriptable frontend for media applications.
Retro pong clone implemented using sfml
A graphics engine + toolkit.
Game development toolkit
A very small multi-platform game engine for creating desktop games.
A truly extensible cross-platform game engine
Convert Ren'Py visual novels into a format your ebook-reader knows
An open source skateboard games engine written in C# and .NET.
C-Lesh is a game programming language for 2D games.
Pear3DEngine is a modern and modular 3D development framework
Open Source Virtual World and MMOG Development Platform
Phobos editor is a generic resource editing system.
C++ Game programming Framework
cross-platform 2d game engine
big map framework using Irrlicht
Cross-platform reimplementation of AMOS BASIC (runtime)