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