Godot is a powerful cross-platform game engine
Real Time Strategy game engine supporting early Westwood classics
Fast and lightweight JavaScript game engine built on WebGL and glTF
A retro game engine for Python
Solar2D Game Engine main repository (ex Corona SDK)
The game engine for everyone
LayaAir is an open-source 2D/3D engine
A Flutter based game engine
2D game development library for Ruby and C++
Powerful, mature open-source cross-platform game engine for Python
Ct.js is a desktop game engine that makes learning programming fun
3D game engine/framework in C, with Luajit and Python bindings now
Flax Engine, multi-platform 3D game engine
Kotlin extensions for the libGDX game framework
Svelto ECS C# Entity Component System
A game framework written with osu! in mind.
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A refreshingly simple data-driven game engine built in Rust
A free 3D game engine to create games and realtimes scenes for Windows
Game engine supporting many 3D/2D formats and graphic effects
Orx: Portable Game Engine
Full featured MUD server with all the trimmings.
Pycraft is an open-source, OpenGL based game made in Python