One of the best Prodigy hacks
All Google Snake mods combined into one
A 2D rigid body physics engine for the web
JavaScript-based game engine designed to empower developers
IsoCity: City building simulation game
2D JavaScript Physics Engine
FlightGear Flight Simulator: free open-source multiplatform flight sim
Full featured MUD server with all the trimmings.
The ultimate cataloguer
Web-based karaoke software suite
build a robot that solves a task from components
A cross-platform chess game.
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
tour based strategic game
Framework for producing web-based database applications
JavaScript framework to build game engines, games, emulators and apps
quiz game with spin wheel
A very efficient tutor.
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
The multiplayer game engine
Jeopardy in HTML and JavaScript
Java Settlers