Godot is a powerful cross-platform game engine
Solar2D Game Engine main repository (ex Corona SDK)
Open source voxel game engine with support for survival and crafting
Voxel game-creation platform with easy modding and game creation
Open source library for creative expression on the web, desktop, etc.
Xash3D FWGS engine
The game engine for everyone
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cross-platform game engine in Rust
New Godot bindings for Swift
A dead simple 2D game engine for Go
Multi-platform 2D and 3D game engine
An easy to use 2D HTML5 game engine written in TypeScript
Cocos simplifies game creation and distribution with Cocos Creator
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
LayaAir is an open-source 2D/3D engine
Open-source engine for Heroes of Might and Magic III
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Magic Another Game Engine
A completely free, open-source, 2D game engine
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Data-Driven Game Engine
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )