Godot is a powerful cross-platform game engine
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Xash3D FWGS engine
GemRB is a portable open-source implementation of the Infinity Engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
The game engine for everyone
A dead simple 2D game engine for Go
New Godot bindings for Swift
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cross-platform game engine in Rust
Orx: Portable Game Engine
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
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
Modern AS3 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
Egret is a brand new open mobile game and application engine