Caffeinated 2.0 is a fast, easy to use, stand alone RSS reader. Built upon version 1.3.3's base system it has been rewritten to be completely stand alone, fast and fun to use.
Please note, Caffeinated does work on 10.6 and is usable, but there are oddities compared to the latest 10.7+ OS's.

Along with its beautiful interface ( which looks stunning on a Retina Display ), Caffeinated also is feature rich, heres a few of what it has to offer:
• Authenticated feeds support
• Manual subscription management, you can import / export, subscribe, unsubscribe and manually reorder your subscriptions
• Share articles to multiple services, these include:
• Twitter ( or on 10.8 you can choose to use the Sharing Service )
• Facebook
• Buffer
• Readability
• Delicious
• Google Plus
• Instapaper
• Pinboard
• Read It Later
• Safari Reading List
• Evernote
• Messages ( 10.8 only via Sharing Service )
• Email ( via your email client )

Download is for version 2.0.3. Commercial version 2.0.5 is available on the Mac App Store.

Requirements:
OS X 10.6-10.8
Intel