Snownews!

Tiny Tiny RSS is an open source web-based news feed (RSS/Atom) reader and aggregator, designed to allow you to read news from any location, while feeling as close to a real desktop application as possible.

Netvibes is a multi-lingual Ajax-based personalized start page or personal web portal much like Pageflakes, My Yahoo!, iGoogle, and Microsoft Live.

Google Reader inspired self-hosted RSS reader, based on JAX-RS, Wicket and AngularJS.

FreshRSS is a free, self-hosted RSS aggregator. It is quite lightweight, fast (it can manage +100k articles without complaining) and powerful (e.g. shortcuts, filters, responsive design, multi-views, multi-themes, multi-users, statistics, provides a Google Reader API, etc.)

KrISS feed is a simple and smart (or stupid) feed reader.To see an online example: http://tontof.net/feed Feel free to contribute: https://github.com/tontof/kriss_feed

RSSPBRRY is a free and open source RSS feed reader distributed under the AGPL v3 license. It's a software fork of Miniflux by super-coder Frédéric Guillot.

Open source planet framework blog aggregator RSS in PHP.