Xash3D FWGS engine
A dead simple 2D game engine for Go
Open source library for creative expression on the web, desktop, etc.
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Multi-platform 2D and 3D game engine
Cross-platform game engine in Rust
GemRB is a portable open-source implementation of the Infinity Engine
Open source reimplementation of GTA San Andreas game engine in 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
Turbulenz is a modular 3D and 2D game framework
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
3D Game engine
Free Android 2D OpenGL Game Engine
Cross-platform 2D game engine