Mac users interested in Zotero 2.1 generally download:
Automatically detect content and easily add it to your personal library. Simplify the process by allowing a single click to save various types of content such as preprints from arXiv.org, journal articles from JSTOR, news stories from the New York Times, and even books from university library catalogs. With support for thousands of websites, it is a comprehensive solution for researchers.
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Helps you collect, organize, cite, and share your research sources.
catalog, Zotero...sites. Zotero collects...else. Zotero automatically indexes
PaperShip is designed to give you access to your Mendeley or Zotero library.
Mendeley or Zotero library
Make researches in any jurisdiction and across all languages.
a variant of Zotero Firefox plugin