Scrabble Score Keeper

Google Code:

Scrabble Score Keeper is a mobile application that helps you keep track of your score while playing Scrabble! You can have up to 4 players or teams, and count your score, including score boosting tiles and you can see up to the last 5 words entered.

Currently the Scrabble Score Keeper is still being developed and in it's beta state, but is hoping to be released early 2013.