Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Multi Theft Auto is a game engine
A multi core friendly rigid body physics and collision detection lib
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Flax Engine, multi-platform 3D game engine
Multi-platform 2D and 3D game engine
A cross platform Lua based game engine
lightweight multi platform game engine
The Atomic Game Engine is a multi-platform 2D and 3D engine
Multi-platform game engine similar to old Megaman with a stage editor
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
TurboSphere is an easy to learn and powerful JS based game engine.
A very small multi-platform game engine for creating desktop games.
Cross-platform 2D game engine