Gapminder

Gapminder one is quite old. It's been several times since I've first come across this web application. First time I've seen it was in one of TED talks (for instance this one). It is a great application for discovering new information in different kind of data. It's a great application to play with and to get a perspective of what is actually going on in large amount of data behind a neat visualisation.

If you do have any time to spent and want to see a great data visualisation tool, I do recommend to try Gapminder, If you do put some effort in it you will have great time with it.