Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Cross-Platform C++ 2D/3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Cocos simplifies game creation and distribution with Cocos Creator
Fast and lightweight JavaScript game engine built on WebGL and glTF
A game engine powered by python and panda3d
A modular Common Lisp game engine
Voxel game engine in C++ with OpenGL
Flax Engine, multi-platform 3D game engine
A Minecraft mapping tool that creates 3D models of your Minecraft
UZDoom is a feature centric port for all Doom engine games
Open game and rendering engine packed into a JavaScript framework
Cross-platform 2D and 3D game engine with modular architecture
Free game engine for development of desktop, mobile, and web games
3D game engine/framework in C, with Luajit and Python bindings now
LayaAir is an open-source 2D/3D engine
3D Procedural Game Engine Using OpenGL
3D game engine with lua scripting
Map Pixel Art Generator for Minecraft
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Java/JavaFX/Kotlin Game Library (Engine)
DeSmuME is a Nintendo DS emulator
A isometric city builder in JavaScript
3D and 2D game engine written in Rust
Various things for PSX (PlayStation 1, PSone)