A MUD client for Android, iOS, Linux, Mac OS X and Windows
A free mixin-based injection hacked client for Minecraft
Compatibility tool for Steam Play based on Wine and other components
1.21.11 Lightweight Minecraft server
Build multiplayer web games played by millions
KildClient is a powerful MUD client with a built-in Perl interpreter
Bloxshade installer source code.
Internet server for Linux Air Combat
The multiplayer game engine
Retro game engine for creating games like it's 1997
Java Settlers
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
Quake C mods and support - SSQC / CSQC
This is a hacking style game set in the early '80s
Battlefield bad company 2 Master server emulator + Server R34
Star Trek Web browser game
Source for the Flash-based Glitch client
A QuakeWorld package containing everything needed to play QW right now
Items, Inhabitants, and other Glitch game assets
Art and source for Glitch's customizable avatars
Open Source Virtual World and MMOG Development Platform
A Windows Gadget For Monitoring, Managing, and Playing Minecraft!