Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cocos simplifies game creation and distribution with Cocos Creator
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform 2D and 3D game engine
Voxel game-creation platform with easy modding and game creation
Free game engine for development of desktop, mobile, and web games
Flax Engine, multi-platform 3D game engine
3D Game engine with editor
3D Procedural Game Engine Using OpenGL
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Data-Driven Game Engine
Urho3D Game engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D C++ Game Engine - yet another open source game engine
Cross-platform 2D and 3D game engine
A 2D game engine and level editor
A cross-platform 2D game engine
Blueshift is a cross-platform 3D game engine implemented in C++
Portable game engine with main focus on point-and-click adventures
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
3D Game engine
2D physics engine for games