RetroArch is a frontend for emulators, game engines and media players.
Godot is a powerful cross-platform game engine
The game engine for everyone
A certain block game
Xash3D FWGS engine
An iOS & tvOS Frontend for Multiple Emulators
A simple and easy-to-use library to enjoy videogames programming
UCI chess engine
Open source HTML5 game framework that offers WebGL and Canvas
Desktop/Android/HTML5/iOS Java game development framework
Home theater software and entertainment hub for digital media
Open source library for creative expression on the web, desktop, etc.
One framework for creating powerful cross-platform games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
New Godot bindings for Swift
The source code to VVVVVV
An open source reimplementation of the Among Us Server
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Do virtual gear shifting (and more) in any rider app
Netcode that provides networking capabilities to GameObject workflows
Cocos simplifies game creation and distribution with Cocos Creator
A dead simple 2D game engine for Go
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Action-adventure game originally released in 2013
Multi-platform 2D and 3D game engine