A free/open source client and automation tool for Ragnarok Online
A Minecraft Launcher which is multi-functional, cross-platform
A game framework written with osu! in mind.
Cross-platform, open source, and super fast MUD client with scripting
A modern shaders mod for Minecraft compatible with existing OptiFine
Open source Old School RuneScape client
C# application with primary purpose of farming Steam cards
An open source implementation of the Ultima Online Classic Client
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A charting and data visualization library for Unity
You can make it - Open Source MMORPG Platform
Retro style, multi-platform soccer game
Official TLauncher for Minecraft: play any version with mods support
Snake Feast is a fun, addictive arcade game where you control a snake
Powering EA's next generation of PC & Mac gaming
A multi-account able app for farming cards in Steam
Turn based tactical RPG with several campaigns, written in Rust
Open source voxel world
Chess program
3D space trading and combat game
Multidocument automation by templates - for sphinx, mkdocs, epydoc ...
Multiplayer space station roleplaying game built on BYOND engine
An RPG with turn based combat
The codebase used by the VORE SS13 server, based on Polaris SS13