Download of OneRing 2.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. OneRing for Mac lies within Audio & Video Tools, more precisely Players.
The OneRing installer is commonly called onering_trial.zip. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This software is compatible with Mac OS X 10.6 or later. The most popular version among OneRing for Mac users is 2.2. The actual developer of this Mac application is AtPill.
From the developer:
It is a simple Mac OS X desktop client for the Pandora music streaming service. The program provides all the Pandora One features and offers various global hotkeys for easy playback control. In order to use this application the user may login with the Pandora One account.
You may want to check out more Mac applications, such as 4Media DVD to iPod Converter or iShout, which might be related to OneRing.