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
Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cross-platform game engine in Rust
Open-source engine for Heroes of Might and Magic III
A dead simple 2D game engine for Go
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Cocos simplifies game creation and distribution with Cocos Creator
Embeddable unity game engine view for Flutter
New Godot bindings for Swift
Open source library for creative expression on the web, desktop, etc.
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Kotlin extensions for the libGDX game framework
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
GemRB is a portable open-source implementation of the Infinity Engine
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
A completely free, open-source, 2D game engine
Urho3D Game engine