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 allows you to keep all your documents, annotations, and flashcards in once place. Never lose track of what you're reading again. Annotate documents directly while reading them and sync with spaced repetition systems like Anki so you never forget an important fact ever again.
Links to official sites
Website annotation Sync with Anki Keeps track of you reading progress Document Repository Annotations and Flashcard Review Technical paper notes Document annotations Capture web pages Text Highlighting Learn with Flashcards Offline Reading Cloud sync PDF annotation Google Chrome Extensions Web-Based Export to PDF