You have installed OverDrive Media Console.
A free, easy-to-use application, OverDrive Media Console allows you to download and enjoy OverDrive MP3 Audiobooks. Use OverDrive Media Console to navigate, play, and bookmark OverDrive media titles and to manage and customize the media library. In OverDrive Media Console you can also transfer media to most Apple® devices and burn CDs of audiobooks (where permitted by the publisher).
Updates of OverDrive Media Console are made available at http://www.overdrive.com/software/omc/.