Sale has ended but you can still get this app.
Download Wordfeud Secretary Now

Official Description

Wordfeud Secretary is an app for keeping track of tiles/letters in your Wordfeud games. Log in using your Wordfeud email/password to see a list of your current games. Click on a game to see which tiles/letters that aren't used. Especially useful in the end-game to out-smart your opponent - a must-have for serious players!

NB: This app is not in any way a cheater! I only provides the same functionality as pen, paper and lots of patience. Approved by Wordfeud League of Honour.