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