Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Free game engine for development of desktop, mobile, and web games
Cocos simplifies game creation and distribution with Cocos Creator
The game engine for everyone
Animation Compression Library
3D C++ Game Engine - yet another open source game engine
2D Game Engine
A 2D game engine and level editor
scriptable game engine with built-in support for 2D graphics and sound
The Atomic Game Engine is a multi-platform 2D and 3D engine
2D physics engine for games
TurboSphere is an easy to learn and powerful JS based game engine.
BxEngine For Marmalade And QT
a flexible game engine