Polar Bookshelf 1.90.18 for Mac can be downloaded from our website for free. The actual developer of this free software for Mac is Kevin Burton. The application lies within Productivity Tools, more precisely Office Tools.
From the developer:
Polar Bookshelf is a personal knowledge repository for PDF and web content supporting incremental reading and document annotation. The application supports reading PDF and provides advanced features like incremental reading, annotation, comments, and spaced repetition.
You may want to check out more Mac applications, such as BookShelf, Trade Nations North Pole or Polar FlowSync, which might be similar to Polar Bookshelf.
E-book Tools
Bookkeeping-Cataloging