SimplePie is an easy-to-use PHP class for RSS ( really simple syndication'). Flexible enough to suit beginners and veterans alike, SimplePie is focused on speed, ease of use, compatibility and standards compliance.
"Newspipe is an RSS/Atom aggregator with a difference: It allows you to keep track of your feeds through e-mail - you create an OPML file listing your feeds and Newspipe will collect them, convert them to e-mail messages and send them to your mailbox."
Gregarius is a web-based RSS/RDF/ATOM feed aggregator, designed to run on your web server, allowing you to access your news sources from wherever you want.