Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open source library for creative expression on the web, desktop, etc.
A dead simple 2D game engine for Go
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
2D Game Engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Egret is a brand new open mobile game and application engine
Cross-platform 2D game engine