Open-source engine for Heroes of Might and Magic III
Multi Theft Auto is a game engine
Solar2D Game Engine main repository (ex Corona SDK)
Open source clone of the Age of Empires II engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
The Tiny JavaScript Game Engine That Can!
RPG Maker 2000/2003 and EasyRPG games interpreter
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Free, open source game engine online
3D Procedural Game Engine Using OpenGL
A game framework written with osu! in mind.
A cross-platform, open-source, pure C game engine for mobile game
Svelto ECS C# Entity Component System
Animation Compression Library
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Embeddable unity game engine view for Flutter
A multi core friendly rigid body physics and collision detection lib
Urho3D Game engine
A fresh & lightweight javascript game engine
A modern, cross-platform Quake game engine based on FitzQuake.
Game engine supporting many 3D/2D formats and graphic effects
SDL based generic 2D game engine
Ze Text Adventure game Builder : Create as you play !
Pycraft is an open-source, OpenGL based game made in Python