An open-source sandbox tower defense game
Desktop/Android/HTML5/iOS Java game development framework
UCI chess engine
A simple and easy-to-use library to enjoy videogames programming
Godot is a powerful cross-platform game engine
One framework for creating powerful cross-platform games
RetroArch is a frontend for emulators, game engines and media players.
Home theater software and entertainment hub for digital media
An iOS & tvOS Frontend for Multiple Emulators
Open source HTML5 game framework that offers WebGL and Canvas
Fast and lightweight JavaScript game engine built on WebGL and glTF
The game engine for everyone
The source code to VVVVVV
An open source reimplementation of the Among Us Server
New Godot bindings for Swift
Netcode that provides networking capabilities to GameObject workflows
Urho3D Game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A dead simple 2D game library for Go
The AWS GameKit Plugin for Unreal
3D Engine c++
Domination is a game that is a bit like the board game Risk
GemRB is a portable open-source implementation of the Infinity Engine
A MUD client for Android, iOS, Linux, Mac OS X and Windows