Godot Minimal Theme
Free game engine for development of desktop, mobile, and web games
3D and 2D game engine written in Rust
3D Game engine with editor
Cross-platform 2D game engine focused on ultimate productivity
Ct.js is a desktop game engine that makes learning programming fun
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
The Tiny JavaScript Game Engine That Can!
Stride (formerly Xenko), a free and open-source cross-platform C# game
Cocos simplifies game creation and distribution with Cocos Creator
Fast and lightweight JavaScript game engine built on WebGL and glTF
The flexible game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Magic Another Game Engine
Cross-platform 2D and 3D game engine with modular architecture
Descent 3 by Outrage Entertainment
A fresh & lightweight javascript game engine
3D game engine with lua scripting
An OpenGL RTS game engine written in C
Injectable LUA scripting system, SDK generator, live property editor
Full featured MUD server with all the trimmings.
SDL based generic 2D game engine
MIT Licensed Open Source version of Torque3D from GarageGames