Podcast Generator is an open source Content Management System written in PHP and specifically designed for podcast publishing. It provides the user with the tools to easily manage all of the aspects related to the publication of a podcast, from the upload of episodes to its submission to the iTunes store.
HolzCast is a jQuery Plugin that uses RSS feeds as a playlist format and supports more than one playlist. View my project page to get an Idea of how it works.
A podcast aggregator written in Python using GTK. Users can subscibe to podcasts and download the latest episodes to their hard drive (iPod support is planned).
Prodder is a command-line tool to download podcast subscriptions (RSS2 enclosures). It can operate interactively or autonomously, categorize feeds, and generate playlists.