The main reason I started to develop PaperTrail was that no other software out there was suitable for literature reviews and identifying commonly cited papers. I've been pointed towards several other options that don't do it.
Cross-platform: Zotero as a browser app isn't comprehensive enough. Mendeley is too much in the power of another company and isn't open source. JabRef is a fair product which I'd probably use if not for the lack of cross-citations.
Mac software: Papers and BibDesk are both citation/paper managers but are OS X only. Papers isn't free. Plus I don't have a Mac.
Cross-platform: Zotero as a browser app isn't comprehensive enough. Mendeley is too much in the power of another company and isn't open source. JabRef is a fair product which I'd probably use if not for the lack of cross-citations.
Mac software: Papers and BibDesk are both citation/paper managers but are OS X only. Papers isn't free. Plus I don't have a Mac.
I've only started using the Mac as my PC, but here's a good review of digital academic workflow on a Mac. The review points to Sente as a ref. manager, although I've never used it.
http://homepage.mac.com/kvmagruder/hsci/resources/workflow.html