RPG Maker 2000/2003 and EasyRPG games interpreter
HTML5 Phigros chart player/simulator
Aim assistance for blocks and mobs
Open-source Android/Desktop remake of Civ V
Open-source rhythm game
An open source re-implementation of RollerCoaster Tycoon 2
Archipelago Multi-Game Randomizer and Server
Doom-based AI research platform for reinforcement learning
One of the best Prodigy hacks
Voxel game-creation platform with easy modding and game creation
The Ren'Py Visual Novel Engine
Access GameLift resources and integrate GameLift into your Unity game
The Oldschool Runescape API wrapper that does more
Endless Sky is a sandbox-style space exploration game
Fully async, multithreaded, predictive, open source, 3.01 reach
Classic overhead run-and-gun game
Multi Theft Auto is a game engine
You can make it - Open Source MMORPG Platform
A game of dungeon exploration, combat and magic
Minecraft map editor and mod
Widelands is a free, open source real-time strategy game
Free and open source real-time strategy game
The main repository for the development of the evolution game Thrive
3D space trading and combat game
Build multiplayer web games played by millions