Endnote and Zotero: "I think Zotero is superior in most respects." But see also the reference to this: "Zotero is not designed for historians, but for people who do 'research' by downloading documents or snippets from the Internet, which can be an unreliable source, and for all the blessings of the Gutenberg enterprise and Google reproductions, and Lexis, and JStor etc, historians have to encounter the primary sources where they are found, and they are mostly text. Still, in checking out Zotero I found some really cool conveniences, like the automatic downloading of a citation of a book. For me the decisive factor will be the ease of writing notes (not copying undigested snippets) and having them documented (Zotero has no place for page number, one of the most important single pieces of data in a citation)."
No further comment!