Zotero [0] is very good. it: - is open source and well maintained. - could be used both online and locally. - offers both folders and tags for organization.

Zotero [0] is very good. it: - is open source and well maintained. - could be used both online and locally. - offers both folders and tags for organization. - could also be used for your pdf-annotation and generic web bookmarking needs. While browsing sites like amazon and open library, you can capture the current page/book with all its metadata (author,year...) directly to Zotero in one click. The heavy-weight champion remains Calibre [1] [0] https://www.zotero.org/support/changelog https://www.zotero.org/support/changelog [1] https://calibre-ebook.com/ https://calibre-ebook.com/