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
Svelto ECS C# Entity Component System
The game engine for everyone
Voxel game-creation platform with easy modding and game creation
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Xash3D FWGS engine
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cocos simplifies game creation and distribution with Cocos Creator
Cross-platform game engine in Rust
New Godot bindings for Swift
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
Embeddable unity game engine view for Flutter
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Kotlin extensions for the libGDX game framework
Open source library for creative expression on the web, desktop, etc.
A completely free, open-source, 2D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
GemRB is a portable open-source implementation of the Infinity Engine
Motor de juegos de aventura programable
Game engine supporting many 3D/2D formats and graphic effects
Orx: Data-Driven Game Engine