Cross-platform 2D game engine focused on ultimate productivity
Stride (formerly Xenko), a free and open-source cross-platform C# game
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
Multi Theft Auto is a game engine
Xash3D FWGS engine
Svelto ECS C# Entity Component System
Flax Engine, multi-platform 3D game engine
A game framework written with osu! in mind.
Descent 3 by Outrage Entertainment
Powerful, mature open-source cross-platform game engine for Python
The flexible game engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open-source engine for Heroes of Might and Magic III
The game engine for everyone
Cocos simplifies game creation and distribution with Cocos Creator
Solar2D Game Engine main repository (ex Corona SDK)
Voxel game engine in C++ with OpenGL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Voxel game-creation platform with easy modding and game creation
Cross-Platform C++ 2D/3D game engine
Open source clone of the Age of Empires II engine
Cross-platform 2D and 3D game engine with modular architecture
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
3D game engine with lua scripting