Readers and Viewers
Headline Viewer. A Windows application that lets you see news headlines from a configurable list of Headline Providers (news sources and weblogs).
Radio. Among other things, Radio is a powerful XML-based news aggregator that runs as a local MS Windows or Mac application. It's closely tied into a weblogging system.
Amphetadesk AmphetaDesk is a news aggregator - it sits on your desktop, downloads the latest news that interests you, and displays them in a quick and easy to use (and customizable!) webpage.
Proggle, Novobot A smart headline viewer which reads RSS files as well as HTML pages.
Reptile. A Java based OCS/RSS reader/writer.
FeedReader A windows desktop/tray app to read and display headlines.
HotSheet An extensible Java reader.
NewzCrawler MS Windows web news reader & browser.
SlashDock MS Windows tray reader
Meerkat (Instructions here)
News Is Free
RSS2rssA perl script to take a group of rss feeds and combine them into one rss feed.
RSS2BloggerA perl link to take a group of rss feeds and push them to a Blogger blog.
RSS Monkey RSS Monkey is a simple, stand-alone script that allows you to add RSS feeds from other sites to your personal site.
Orchard/RSS Orchard RSS is a cross-language Groves-based parser for RSS. It currently works in Perl, Python and C.
RDF::RSS A Perl-based RSS parser for RDF. Uses the Redland RDF Application Framework
Slashwatch A PHP newsgrabber that reads RSS files and stuffs them in a MySQL database for later use.
Jetspeed An open source, Java and XML-based implementation of a Web portal. Reads RSS files and ouputs them in many formats.
XML::RSS A Perl module to read and write RSS files.
GrabNews. An Open source MS ASP solution to collecting and displaying RSS news feeds.
Hotscripts search: http://www.hotscripts.com/search/?query=rss&category=all&bool=AND
Sourceforge search: http://sourceforge.net/search/?type_of_search=soft&words=rss