NetNewsWire

NetNewsWire is an easy-to-use RSS reader. The surface is modeled by Mac Mail. Features include tabbed browsing, Smart Folders, download podcasts and share them with iTunes, and Flagged Items, Feed posts of the news reader even after the feed update further indicates.

NetNewsWire supports synchronization with NewsGator (in the business sector) and Google Reader. Thereby you can manage your feeds online and with NetNewsWire, read and sync them.