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[0] Peapod [1] Catcher [2] 
Peapod is a powerful and easy to use command-line tool for downloading podcasts. It’s written in Python and uses Mark Pilgrim’s excellent feedparser library to understand atom and RSS feeds. While Peapod has primarily been developed on linux it should work on any unix-like operating system.
Podcast Software List - Many Platforms Including Windows, Macintosh and Linux
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