calibre organises an ebook collection, edits its metadata and includes a reader. File conversion and transfers to reading devices make it useful when course reading is scattered across compatible ebook formats.
It earns tenth because managing a large ebook library is a narrower need than recording a presentation with #9. Start by giving one course a consistent tag and checking its file formats. If most of your reading lives in a browser or a reference manager, the higher-ranked tools deserve installation first.
Source: calibre · AI illustration: Topnilo · OpenAI. Created with OpenAI; resized/recompressed.