arXivNow 0.6 for Mac was available as a free download on our application library. The application belongs to Productivity Tools. This free Mac app was originally developed by Dr. Jason Melbourne.
From the developer:
arXivNow is an efficient application to browse Astro-ph. It supports keystroke browsing, filtering of articles by your chosen keywords, saving interesting articles into your database, and it tracks the days you have visited Astro-ph. This app also produces bibtex files for easy integration with Bibdesk and Latex.
You may want to check out more software for Mac, such as Combine PDF's or MakeDocJ, which might be similar to arXivNow.