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