RetroArch is a frontend for emulators, game engines and media players.
A cross-platform PSP emulator
Godot is a powerful cross-platform game engine
An open-source sandbox tower defense game
The game engine for everyone
Open source voxel game engine with support for survival and crafting
A simple and easy-to-use library to enjoy videogames programming
Stream switch games to your PC via USB or network
A certain block game
Xash3D FWGS engine
Open source HTML5 game framework that offers WebGL and Canvas
An iOS & tvOS Frontend for Multiple Emulators
UCI chess engine
Desktop/Android/HTML5/iOS Java game development framework
Sandbox video game with a powerful physics engine
Open-source Android/Desktop remake of Civ V
One framework for creating powerful cross-platform games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Home theater software and entertainment hub for digital media
The source code to VVVVVV
New Godot bindings for Swift
An open source reimplementation of the Among Us Server
Do virtual gear shifting (and more) in any rider app
Free, cross-platform 2D game engine powered by Haxe and OpenFL