PyCAPGE - Python Classic Adventure Point and Click Game Engine
2D Game Engine
A real-time game development platform
Multidocument automation by templates - for sphinx, mkdocs, epydoc ...
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
An open source skateboard games engine written in C# and .NET.
An extensible development framework for roleplay games.
The Objective-C Interactive Simulation Abstraction Layer