OverDrive is a very common provider for eBooks and Audiobooks for the many public libraries. The ODMC is the application used to download resources.
OD now supports MP3 for all its audio-books and epub for their ebooks. This allows you to use it on Linux.
To use ODMC on Linux, you need to install wine and winetricks. On a debian-based system, you can do:
sudo apt-get install wine-stable winetricks -qy