Open source library for creative expression on the web, desktop, etc.
utility collection for 2D game development in Java; sound-player
Utility for viewing ZX Spectrum emulator snapshot files.
A cross platform Lua based game engine
3D .NET engine for Windows, Linux, Mac
Cross-platform C framework very compact libraries and tools.
DiaT is a Textadventure
Cross-platform 2D game engine
Isometric engine for 2D rendering with XNA and SDL