A cross-platform interpreter for many point-and-click adventure games
A JavaScript game library to quickly develop board games for the web
3D .NET engine for Windows, Linux, Mac
Multithreaded N-Point Gravity Simulation for PC and Android
Cross platform Game Creation Software
C-Lesh is a game programming language for 2D games.
LEGADEE (LEarning GAme DEsign Environment)
The classic intelligent role playing game