Gideros Release version
Arianne is an engine to develop multiplayer online games like Stendhal
INSTEAD - Simple Text Adventure Interpreter.
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
JavaScript framework to build game engines, games, emulators and apps
Java Settlers
Portable game engine with main focus on point-and-click adventures
Build Cross-platform Applications
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Asphyre is a cross-platform framework for Delphi and FreePascal.
3D .NET engine for Windows, Linux, Mac
Single-/multi-player card game Mau Mau (similar to UNO®)
Cross platform Game Creation Software
C++ game libraries plus server.
Cross-platform reimplementation of AMOS BASIC (runtime)
The classic intelligent role playing game
Game framework on top of Python, Panda3D and Twisted
Make games with Lego-like building blocks