[aragonite]

It's most commonly used by academics for automatically extracting citation metadata from journal article pages from JSTOR, Springer, Elsevier etc. in a structured format (instead of having to enter them manually) and saving them to a local library. Also automatically saves the PDF locally if you have access to it.

It also has a Word add-on that allows you to insert citations as dynamic Word "fields" linked to items in your Zotero Library, so citations can be automatically kept in sync with your Zotero Library and can be easily converted to different formatting styles.