Juice Receiver (formerly know as iPodder) is a free open source media aggregator which automatically downloads podcasts and media files to your computer or portable device, leaving you one-click-away from latest media feeds.  Juice lets users select and download shows and music and play whenever they want on their iPods, portable digital media players, or computers automatically. If you want to listen to internet audio programs (podcasts), music and shows but can't when they are scheduled? Juice is for you!

Juice is  implemented Juice in Python and supports most RSS protocols and scans for enclosures. If the enclosure is in the form of a BitTorrent file, it will download the torrent file in the background. If the mediaplayer on the system supports it, the downloaded content is automatically added to playlists. The content is kept on the local harddrive in nested folders, titled with the show's name.

Juice Home Page 

Juice Documentation

Juice Download Page