Do virtual gear shifting (and more) in any rider app
Xash3D FWGS engine
A dead simple 2D game engine for Go
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Open source library for creative expression on the web, desktop, etc.
Multi-platform 2D and 3D game engine
Cross-platform game engine in Rust
GemRB is a portable open-source implementation of the Infinity Engine
A MUD client for Android, iOS, Linux, Mac OS X and Windows
Reactive extensions for Unity
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
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Cross-platform 2D game engine