Ensemble2 is a free Feedreader on MacOSX.
Main feature:
Correnspond for RSS0.9x/1.0/2.0 Atom0.3/1.0
Correnspond for PodCast/VideoCast/PhotoCast (RSS2.0 Enclosure)
2-4pane changeable
Manage feed list with tab ("box")
Synchronize database via network (.mac/FTP)
Custom pasteboard can copy with a optional format
Post to sorcial bookmark service
Smart list
Search
Manage History
Tagging with entries
Protect or mark flag on a entry
