Zotero, offered either as a Firefox plug-in, Google Chrome connector, Safari connector, or a standalone desktop download, provides all the functions of a standard citation manager. It aids in data collection, organization, and collaboration.
This free, downloadable citation manager captures screen images and citation data from web pages, databases, and online catalogs.
Zotero's standalone desktop citation manager is downloadable for Windows, Mac, and Linux operating systems.
New, free, mobile apps are also available for Zotero.