QuiteRSS is a free open source RSS and Atom feed reader for Windows, Linux, OS/2 and Mac OS X. It supports more than 30 languages.
Main features:
Embedded webkit based browser.
Feed and news filters: new, unread, starred, deleted.
Custom user filters.
Proxy configuration: automatic or manual.
Feed import wizard: Search feed URL if site URL was entered.
Build in Adblocker.
Automatic update feeds: on startup, by timer.
Automatic cleanup on close using criterias.
Enable/Disable images in news preview.
Sound and Popup notification on new news.
Show new or unread news counter on tray icon.
Import/Export feeds (OPML-files).