Multi Theft Auto is a game engine
Xash3D FWGS engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
A retro game engine for Python
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Vivid is a modern C++ 3D engine using OpenGL4+
OpenSAGE is a free, open source re-implementation of SAGE
Java decentralized cross-platform network multiplayer game engine
Simple and low-consumption Java 2D Game Engine
Java Game Engine Project
2D physics engine for games
Java Client + JS/Canvas Server-Side System, with maintained Objects
A game engine in java for 2D strategy games
Java game engine for shoot 'em ups, using Java2D.
Free MMORPG Engine. Develop and host graphical browser-based games.