EndNote, Zotero, Mendeley, Qiqqa, JabRef, Paperpile, ReadCube Papers, Researcher PRO, wizdom.ai, EasyBib, PDF Stacks, BibGuru, Weava, PubChase, Zenreader, DeepDyve, Bibfilex, ZoteroBib, Microsoft Word Plugin for Zotero, BibTeXSearch, LibreOffice Plugin for Zotero are some alternatives to BibDesk.