Paperpile 21.7 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is a product of Paperpile. We recommend checking the downloaded files with any free antivirus. The most popular version of the software is 0.5. The program lies within Internet & Network Tools, more precisely RSS Tools.
From the developer:
Paperpile is your one-stop shop to find, organize, cite and share scientific papers.
It is the user’s choice which content to read.Besides reading printed daily newspapers, many people make use of so-called RSS feeds containing topics they are really interested in.
You may want to check out more Mac applications, such as Pineapple News, Rss Growler or Pressjack Free Edition, which might be related to Paperpile.