Godot is a powerful cross-platform game engine
Xash3D FWGS engine
The Ren'Py Visual Novel Engine
Open source voxel game engine with support for survival and crafting
Real Time Strategy game engine supporting early Westwood classics
The game engine for everyone
A game engine powered by python and panda3d
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Multi Theft Auto is a game engine
Voxel game-creation platform with easy modding and game creation
Solar2D Game Engine main repository (ex Corona SDK)
A complete 3-D game development suite written in Java
A retro game engine for Python
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open-source engine for Heroes of Might and Magic III
Cross-Platform C++ 2D/3D game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A refreshingly simple data-driven game engine built in Rust
Voxel game engine in C++ with OpenGL
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Free game engine for development of desktop, mobile, and web games
Cocos simplifies game creation and distribution with Cocos Creator
dhewm 3 main repository
Open source clone of the Age of Empires II engine