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