Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
LayaAir is an open-source 2D/3D engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cross-Platform C++ 2D/3D game engine
A game engine powered by python and panda3d
Free game engine for development of desktop, mobile, and web games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A Minecraft mapping tool that creates 3D models of your Minecraft
Voxel game engine in C++ with OpenGL
Cocos simplifies game creation and distribution with Cocos Creator
Cross-platform 2D and 3D game engine with modular architecture
Map Pixel Art Generator for Minecraft
Various things for PSX (PlayStation 1, PSone)
3D Game engine with editor
A modular Common Lisp game engine
One framework for creating powerful cross-platform games
3D Procedural Game Engine Using OpenGL
Java/JavaFX/Kotlin Game Library (Engine)
UZDoom is a feature centric port for all Doom engine games
3D game engine/framework in C, with Luajit and Python bindings now
3D and 2D game engine written in Rust
DeSmuME is a Nintendo DS emulator
Open source library for creative expression on the web, desktop, etc.
Desktop/Android/HTML5/iOS Java game development framework
Zig game engine & graphics toolkit