AppWage is an open source Mac OS based iTunes reporting tool from Hankinsoft with a great interface for viewing app sales information, track competition and more using iTunes Connect data.
With AppWage you can view sales reports, reviews, rankings, and track the competition. You can send daily emails using your own SMTP server, and automatically translate app reviews.
You can find AppWage on the homepage here.
You can find the source code on Github here.
A nice tool for tracking app data.