Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The game engine for everyone
Free game engine for development of desktop, mobile, and web games
Voxel game-creation platform with easy modding and game creation
Open source library for creative expression on the web, desktop, etc.
A dead simple 2D game engine for Go
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform 2D and 3D game engine
New Godot bindings for Swift
The Ren'Py Visual Novel Engine
Cross-platform game engine in Rust
Solar2D Game Engine main repository (ex Corona SDK)
Fast and lightweight JavaScript game engine built on WebGL and glTF
Stride (formerly Xenko), a free and open-source cross-platform C# game
A fresh & lightweight javascript game engine
An easy to use 2D HTML5 game engine written in TypeScript
GemRB is a portable open-source implementation of the Infinity Engine
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Orx: Data-Driven Game Engine