Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Desktop/Android/HTML5/iOS Java game development framework
The game engine for everyone
2D Game Engine
Build Cross-platform Applications
The Atomic Game Engine is a multi-platform 2D and 3D engine
SuperWikia: The Runtime/Realtime Environment for Codesmiths
NinYawg Adventure
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
Investigo - DX9 Performance and Debugging Toolkit
A cross-platform OpenGL based lightweight scenegraph library