Cocos simplifies game creation and distribution with Cocos Creator
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cross-platform game engine in Rust
Open source library for creative expression on the web, desktop, etc.
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Modern AS3 Game Engine
Egret is a brand new open mobile game and application engine