Pheeder is a PHP5 RSSfeed generator. It implements the complete RSS 2.0 specification and is extremely easy to use. It also features extensive documentation.
A library for Atom / RSSfeed fetching and parsing. Maps all feeds (where possible) to the latest Atom format, so that your code doesn't have to care what format the source was in. Supports Atom 1.0, 0.3, RSS 2.0, 1.0, 0.9x
Live-bookmarks Manager is a Perl CGI script that helps you manage your live-bookmarks / RSS feeds through an easy to use web-interface. Currently it can add and delete bookmarks to/from an RSSfeed.
newslog is a tool that can display a large ammount of news feeds
using a simple aggregation method to order the apperances
by name and plot them by the similar articles that exist.