FPS Unlocker for Roblox
Stream switch games to your PC via USB or network
Set of Python modules designed for writing video games
Desktop/Android/HTML5/iOS Java game development framework
Godot is a powerful cross-platform game engine
A simple and easy-to-use library to enjoy videogames programming
A cross-platform PSP emulator
Open source cross-platform multi-purpose game toolkit
One framework for creating powerful cross-platform games
GUI for downloading/managing homebrew apps for video game consoles
Real Time Strategy game engine supporting early Westwood classics
Multi Theft Auto is a game engine
A Native GOG and Epic Games Launcher for Linux, Windows and Mac
Lutris desktop client in Python
Skript is a Bukkit plugin which allows server admins
Injectable LUA scripting system, SDK generator, live property editor
Cross-platform rhythm game for the keyboard
Accuracy-focused XNA4 reimplementation for open platforms
RetroArch is a frontend for emulators, game engines and media players.
Open Source MMORPG Framework
Doom-based AI research platform for reinforcement learning
Open source clone of the Age of Empires II engine
LayaAir is an open-source 2D/3D engine
Solar2D Game Engine main repository (ex Corona SDK)
The game engine for everyone