High performance UI layout library in C
PyCAPGE - Python Classic Adventure Point and Click Game Engine
SDL based generic 2D game engine
Visual Basic 6 2D online adventure game engine
Flexible and easy-to-use 2d game engine
2D game engine for traditional platform games
Paintown is a 2d fighting game engine.
Soft body game engine
Java Game Engine
A Simple Game Engine
A complete 2D Game Engine with built in drag and drop editor
Cross-platform 2D game engine
OSGET is the first open source mobile game engine template.