SCRATCH.com Scratch is a tool that MIT has released for free, and it allows kids (or anyone) to make games with a simple block-based interface.
Minecraft. This construction game can be used in a variety of ways. It’s like LEGO for the computer
Virtual Stock Exchange: http://www.marketwatch.com/game/ Created by Marketwatch, this lets participants invest fake money into the real stock market. An excellent educational tool for developing financial literacy skills.