One of the best Prodigy hacks
Fully async, multithreaded, predictive, open source, 3.01 reach
Fast, user-friendly cross-platform custom launcher for Minecraft
Full featured MUD server with all the trimmings.
The ultimate cataloguer
Arianne is an engine to develop multiplayer online games like Stendhal
JavaScript framework to build game engines, games, emulators and apps
Chess application whichs allows working with chess PDF books and PGNs.
X3D is the open-standard format for 3D graphics scenes on the Web.
Mech Station Beta - Tower Defense like Game
Web-based karaoke software suite
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
The multiplayer game engine
A Rust framework for building Minecraft servers
Java Settlers
A Forge mod that implements SpongeAPI
Minecraft Forge Hybrid server implementing the Spigot
Playing Go with web-based turn-based Go server