HTML5 Phigros chart player/simulator
RPG Maker 2000/2003 and EasyRPG games interpreter
Universal Aim Assist Framework
An open source re-implementation of RollerCoaster Tycoon 2
A Minecraft Mod about Matter and Energy
Aim assistance for blocks and mobs
Archipelago Multi-Game Randomizer and Server
Access GameLift resources and integrate GameLift into your Unity game
One of the best Prodigy hacks
A Game Server Skeleton in golang
Voxel game-creation platform with easy modding and game creation
Open-source rhythm game
The main repository for the development of the evolution game Thrive
Multi Theft Auto is a game engine
Magic Another Game Engine
The Oldschool Runescape API wrapper that does more
Classic overhead run-and-gun game
A bridge/proxy allowing you to connect to Minecraft
Build multiplayer web games played by millions
You can make it - Open Source MMORPG Platform
Open-source Android/Desktop remake of Civ V
Minecraft map editor and mod
Jazz² Resurrection: Open-source reimplementation of Jazz Jackrabbit 2
A game of dungeon exploration, combat and magic
Widelands is a free, open source real-time strategy game