RPG Maker 2000/2003 and EasyRPG games interpreter
HTML5 Phigros chart player/simulator
Aim assistance for blocks and mobs
Open-source rhythm game
Open-source Android/Desktop remake of Civ V
An open source re-implementation of RollerCoaster Tycoon 2
Retro Bowl is an American football game in retro style
Archipelago Multi-Game Randomizer and Server
One of the best Prodigy hacks
Doom-based AI research platform for reinforcement learning
Voxel game-creation platform with easy modding and game creation
Access GameLift resources and integrate GameLift into your Unity game
The Oldschool Runescape API wrapper that does more
The Shiptest Codebase
Endless Sky is a sandbox-style space exploration game
The Ren'Py Visual Novel Engine
Fully async, multithreaded, predictive, open source, 3.01 reach
Classic overhead run-and-gun game
A game of dungeon exploration, combat and magic
Multi Theft Auto is a game engine
You can make it - Open Source MMORPG Platform
Experimental menu for GTA 5: Enhanced
Minecraft map editor and mod
Widelands is a free, open source real-time strategy game
Build multiplayer web games played by millions