Godot is a powerful cross-platform game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
Xash3D FWGS engine
The game engine for everyone
GemRB is a portable open-source implementation of the Infinity Engine
A JavaScript engine optimized for running React Native
A dead simple 2D game engine for Go
New Godot bindings for Swift
An iOS & tvOS Frontend for Multiple Emulators
A Minecraft Java Edition Launcher for Android and iOS
An open-source sandbox tower defense game
A certain block game
Open source HTML5 game framework that offers WebGL and Canvas
A multi-platform support c++11 library with focus on asio
Free, cross-platform 2D game engine powered by Haxe and OpenFL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
RetroArch is a frontend for emulators, game engines and media players.
Orx: Portable Game Engine
Wire for iOS (iPhone and iPad)
UCI chess engine
Play! - PlayStation2 Emulator
Cross-platform game engine in Rust
Desktop/Android/HTML5/iOS Java game development framework