Xash3D FWGS engine
A modular Common Lisp game engine
Magic Another Game Engine
The Tiny JavaScript Game Engine That Can!
Godot Minimal Theme
The multiplayer game engine
Web powered cross-platform 3D, WebXR game engine
scriptable game engine with built-in support for 2D graphics and sound
Godot is a fully featured, open source, MIT licensed, game engine.
Educational framework for OpenGLES, OpenCL and OpenAL