Wizzrss.com offers simple RSS and Atom (Supports Podcasts) news reading extension. The free aggregator extension can be used for Firefox. It works with Atom 0.3, Atom 1.0 and all versions of RSS news feeds.

Cherrypy.org offers object-oriented HTTP framework in Python, with flexible configuration and extension, including code, documentation, FAQ, wiki, news, a tutorial, downloading and more for the web developers.

FirePHP offers Firefox extension for PHP application development and AJAX Development.