Open Source for Mac OS X

Juice Receiver (formerly iPodder) is a media aggregator which automatically downloads podcasts and media files to your computer or portable device, leaving you 'one-click-away' from latest media feeds. The whole process is done on it's own, so you don't have to select files, search for them or click links to download the media. All you do is specify some hotspots where to download from and wait to get yourself the content.