Desktop/Android/HTML5/iOS Java game development framework
Orx: Data-Driven Game Engine
2D Game Engine
Cross-platform 2D and 3D game engine
Portable game engine with main focus on point-and-click adventures
Build Cross-platform Applications
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Open Game Bootstrap
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Mahasona engine is an open source game engine.
Cross platform Game Creation Software
Cross-platform C framework very compact libraries and tools.
a game library to develop audio games
3D Game engine
It's a game based on a puzzle survive sistem.
Lightweight C++ combinatorial-game development framework.
Convert Ren'Py visual novels into a format your ebook-reader knows
NinYawg Adventure
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
An open source C++ console based game (Windows only).