Free Fantasy Football Stat Tracker is a cool application and can be had very easily from the source forge website.
According to the app description, a Fantasy (American) Football stat tracker and live scoring program written in PHP. Statfink works best with Yahoo fantasy football leagues. One player installs statfink on a server and the rest of the league can view a webpage to get free live scoring.
Cheat Sheet tips and calculator is another popular reference used in the Fantasy Football game. For more on this, check here: