From the site:
freshmeat maintains the Web's largest index of Unix and cross-platform software, themes and related "eye-candy", and Palm OS software. Thousands of applications, which are preferably released under an open source license, are meticulously cataloged in the freshmeat database, and links to new applications are added daily. Each entry provides a description of the software, links to download it and to obtain more information, and a history of the project's releases, so readers can keep up-to-date on the latest developments.
Of the feeds available, I chose fm-releases.rdf because it gives descriptions of the software (as opposed to fm.rdf, which simply gives links). If anyone is interested, there is an RSS feed for theme releases (fm-releases-themes.rdf) and one for Palm OS software (fm-releases-palm.rdf); I didn't bother with these. There is also fm-newsletter.rdf which provides longer descriptions but also includes the various articles that they post. Might be worth another feed -- freshmeatnews, maybe?