RSSOwl is a news aggregator for RSS and Atom News feeds.

Feeder is a web based RSS feed reader.

Wachete is a website content monitoring platform.

QuiteRSS is a cross-platform RSS/Atom news feed reader written using Qt.

Feedbro is a browser extension for Google Chrome that adds local feed reading capabilities to the web browser.

WebSite-Watcher detects website updates and highlights all changes in the text.