Polar

Polar is a 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. Polar, a feature-rich note-taking app, is perfect for managing your web pages, text books, and PDFs. Polar allows you to structure your notes the way you want it so you can remember them without any hassle whatsoever.