Virtual Stock Exchange - Stock market game and message boards. Trade stocks and funds in a collaborative environment. Run your own competition or join others.

Blogshares - Fantasy weblog stock game, where weblog value is based on hits and links.

BullBearings - A free UK based investment website featuring fantasy stocks and virtual financial spread betting.

Case Game, LLC - urladex - Trade virtual shares in web sites based on their Alexa traffic rating.

Foresight Exchange - A notional stock market where you buy shares betting on the outcome of future events.

The Great Game - Equity trading on the London Exchange. Free prizes for the best performing portfolio each month. Direct links for research and analysis.

MockTrading.com - Free mock commodity trading.

Stock-Trak - Stock market game where you simulate managing a portfolio of stocks, bonds, mutual funds, options and futures. Test an investment idea, learn about the financial markets, or develop a track record.

TradersGame.com - Option market simulation. Derivatives pricing calculators for treasury managers, hedgers and traders.

U.S Idea Futures Exchange - A free web-based futures market.

Wall Street Raider - Windows based investing game. Includes information and download links.

Xodds.com - Offers fixed-odds financial betting with either virtual or real accounts.

Xycoon Online - Virtual stock exchange. Free simulated trading.