Free, cross platform, open-source syndicated news aggregator. Offers thousands of channels to choose from.

Simple RSS aggregator written in PHP. Easily integrates in website pages and supports RSS 0.9, 0.91, 0.92, and 2.0 feeds.

Server side personal RSS and Atom 0.3 aggregator which are marketed as a better alternative to the plain desktop aggregators.

Non-intrusive RSS, ATOM, NNTP, and HTML reader designed for Firefox, Mozilla, Netscape and Thunderbird.

RSS, RDF, and Atom reader and aggregator for Windows and Unix-resembling operating systems such as FreeBSD, Linux, or MacOS X.

Social media application provides a web edition that acts as an RSS reader and bookmark manager.

RSS aggregator written in Ruby. Offers customizable keybindings, basic HTML rendering, HTTP proxy support, OPML import and export, themes, and support for various RSS versions.

Server-side RSS aggregator written in PHP with MySQL. Integrates with web browsers and records of items that have or have not been viewed.

Free multi-user, web-based RSS aggregator written in Python with MySQL database.

Feed reading software available for the iPhone, iPad, Kindle Fire, PlayBook, and desktop computers.

Simple and free RSS and Atom news aggregator available as a Mozilla Firefox extension.