Godot is a powerful cross-platform game engine
Open source cross-platform multi-purpose game toolkit
A simple and easy-to-use library to enjoy videogames programming
Open-source Android/Desktop remake of Civ V
Desktop/Android/HTML5/iOS Java game development framework
Voxel game-creation platform with easy modding and game creation
A Minecraft Java Edition Launcher for Android and iOS
Xash3D FWGS engine
A cross-platform PSP emulator
A certain block game
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
One framework for creating powerful cross-platform games
Stream switch games to your PC via USB or network
Cross-platform game engine in Rust
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cocos simplifies game creation and distribution with Cocos Creator
RetroArch is a frontend for emulators, game engines and media players.
Open source HTML5 game framework that offers WebGL and Canvas
The game engine for everyone
A dead simple 2D game engine for Go
Do virtual gear shifting (and more) in any rider app
The source code to VVVVVV
Open source library for creative expression on the web, desktop, etc.
An Android application for browsing video games