Polar is described as 'Powerful desktop app for managing all your web content, books, and notes. Polar keeps all your content in one place, supports tagging, annotation, highlighting and keeps track of your reading progress' and is a popular Read It Later tool in the news & books category. There are more than 50 alternatives to Polar for a variety of platforms, including Mac, iPad, iPhone, Windows and Web-based apps. The best Polar alternative is calibre, which is both free and Open Source. Other great apps like Polar are Zotero, wallabag, TagSpaces and Instapaper.
Cardfile is a personal information manager, based on index cards, that was distributed with Microsoft Windows starting from the original version 1.01 until Windows NT 4.0 Server. Cardfile is also included with Windows 98 and Windows Millennium Edition, but has to be installed...
forlater is an email-based bookmarking service. You send us an email with a link (or links), and receive a readable, clutter-free version of the article in an email.
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