ReadKit
Since Google Reader shut down I’ve been using Fever°. It’s not perfect, but it works for me. Especially on iOS where Reeder 2 (App Store US, App Store DE) allows me to read all my articles in the app. Unfortunately, Reeder’s desktop version never got updated to support Fever°. (At least not until the last time I checked which has been a while now.)
So, when at the computer, I had to read my feeds using the web interface which kinda sucked because it would reload every now and then and therefore lose my reading position.
A few days back I found ReadKit. Never heard of it before I instantly liked it’s look (probably because of it’s familiarity to Reeder). Nice fact: It does not only support Fever°. You can also use it for Instapaper (subscription required), Pocket, Readability, Pinboard, Delicious, Feedly and a few others.
So, If you want an OS X client for Fever° as well go check out ReadKit (Mac App Store US, $5.99; Mac App Store DE, 4,99€).
For a full feature list visit the ReadKit’s website.