Download of btcbar 2.1.4 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. The software lies within Business Tools, more precisely Finances.
The actual developer of this free software for Mac is Chris Shiplet. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
btcbar is a tiny open source widget for OS X that displays the latest USD/BTC spot price from BitStamp, BTCe, and Coinbase. The program has an easy to use interface, it has only a single function: "Open in browser". This application lives your menu bar.
You may want to check out more Mac applications, such as Putler, Airfoil Speakers or instantAdmin, which might be similar to btcbar.