NewPodFeed is free, open source software that helps you to create and generate iTunes-compatible podcast RSS feed XML so you don't have to do it by hand. Just fill in the fields, click generate, copy, paste, and you have the RSS feed you need. It's written in Java and works on Linux, Mac OS X, and Windows.
Development of NewPodFeed has moved to:
http://newpodfeed.googlecode.com
Active development and new releases can be found there.
Current Version: 1.0
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