Sachsen is the native OS X client for App Store reviews. Think of it as Mail.app for your app’s reviews. Organize, analyze, translate and share them.
For anyone who’s got an app on the App Store, reviews are the main feedback channel. Love ’em or hate ’em, but never ignore them.
There’s a one week trial and the full version is 20 USD. No account needed. It’s a 4.0 MB download.