Desktop/Android/HTML5/iOS Java game development framework
Orx: Portable Game Engine
Everything you need to build and deploy scalable realtime 3D apps
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Cross platform SDK
ZED OS the clone of Windows XP
A JavaScript game library to quickly develop board games for the web
C-Lesh is a game programming language for 2D games.