Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The game engine for everyone
Cross-platform game engine in Rust
Free, cross-platform 2D game engine powered by Haxe and OpenFL
A dead simple 2D game engine for Go
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
New Godot bindings for Swift
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
Open source library for creative expression on the web, desktop, etc.
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
Urho3D Game engine
2D Game Engine
Cross-platform 2D and 3D game engine
The Atomic Game Engine is a multi-platform 2D and 3D engine
online 4X browser game engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
2D physics engine for games