Magic Another Game Engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Solar2D Game Engine main repository (ex Corona SDK)
Open Source real-time strategy game engine for early Westwood games
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
Svelto ECS C# Entity Component System
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Animation Compression Library
A game framework written with osu! in mind.
Embeddable unity game engine view for Flutter
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
Game engine to build text adventures.
Javascript library for making tile based games
RTSish Game Engine
Free and Open Game Programming Language for Windows and GNU/Linux
Game engine for playing tomb raider 1 - 5 levels.
A space race game in the style of A Dark Room
Multi-platform game engine similar to old Megaman with a stage editor
Paintown is a 2d fighting game engine.
Mahasona engine is an open source game engine.
Open Source 3D Game Engine