Godot is a powerful cross-platform game engine
Magic Another Game Engine
Multi Theft Auto is a game engine
Real Time Strategy game engine supporting early Westwood classics
The game engine for everyone
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Free, open source game engine online
Open source voxel game engine with support for survival and crafting
Open source clone of the Age of Empires II engine
Solar2D Game Engine main repository (ex Corona SDK)
Fast and lightweight JavaScript game engine built on WebGL and glTF
The Tiny JavaScript Game Engine That Can!
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A refreshingly simple data-driven game engine built in Rust
2D game development library for Ruby and C++
A Flutter based game engine
A retro game engine for Python
A cross-platform, open-source, pure C game engine for mobile game
Injectable LUA scripting system, SDK generator, live property editor
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
3D Procedural Game Engine Using OpenGL
Open Source real-time strategy game engine for early Westwood games
Powerful, mature open-source cross-platform game engine for Python
Cross-Platform C++ 2D/3D game engine
The flexible game engine