Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
MIT Licensed Open Source version of Torque3D from GarageGames
Vivid is a modern C++ 3D engine using OpenGL4+
Cross-platform 3D scene editor based on three.js, golang and mongodb
A 3D game engine in java.
An advanced flexible game engine for Java.
Visual Novel engine, editor and game development.