Injectable LUA scripting system, SDK generator, live property editor
2D game development library for Ruby and C++
GemRB is a portable open-source implementation of the Infinity Engine
Game engine supporting many 3D/2D formats and graphic effects
Vivid3D is an open-source 3D engine with powerful 2D UI.
Go 3D Game Engine
A project to create a blazingly fast Swift game engine
scriptable game engine with built-in support for 2D graphics and sound
2D physics engine for games
A truly extensible cross-platform game engine