Everything you need to get started in three easy steps.
1. Zotero runs either as a stand-alone client, or from within the Firefox Web Browser. You can download Firefox for free here. You can download the stand alone client here. If using the standalone client, skip to step 4.
3. If you want to integrate Zotero with your word processor, you will need to download an additional plug-in here.
Zotero Bookmarklet: Allows you to save items from mobile devices and other browsers.
Zotfile: Bring advanced PDF management to Zotero with the optional Zotfile add-on.
More Zotero plugins are available here.