Gregarius is a Web-based RSS/RDF/ATOM news aggregator, which features for OPML import/export, XHTML/CSS output and an AJAX-based item tagging system. This RSS aggregator project is designed to create a number of web pages that you could visit, containing a combined list of sites and blos that you're interesed in, ordered from newest to oldest. Gregarius comes with a neat interface, great documentation and a good (and growing) set of additional features and plugins. It will appeal to both novice users as well as more experienced developers who're looking for something to run on their own server that they can possibly extend, rather than the usual web-based versions.

Features of Gregarius:
- Completely web-based (runs on your web server)
- Simple, password-protected, administration and configuration
- AJAX powered item tagging
- Full-text search
- Committed to web standards: renders XHTML/CSS, supports OPML
- Gregarius is FREE software and is released under the GPL