Other citation tools

ACS ChemWorx is a free research management and storage system that combines reference discovery and management, professional networking, group and task management and manuscript preparation.

Colwiz was created by researchers at the University of Oxford and  is a free reference management tool that provides an easy way to find, read, and cite papers for students, academic groups, and researchers.

JabRef is an open source bibliography reference manager. The native file format used by JabRef is BibTeX, the standard LaTeX bibliography format. JabRef runs on the Java VM (version 1.6 or newer) and should work equally well on Windows, Linux and Mac OS X.

Papers can help you search for and download articles to your desktop. (Papers was originally developed for the Mac OS but, is now available for IOS and Windows.) The Stanford University Libraries offer limited support for Papers users, particularly with issues involving connectivity with library-supported resources.  Free trial (for Mac and PC).  Papers app in iTunes store.

RefME is a free tool to create citations, reference lists and bibliographies in just a click. Available on the web or as an iOS or Android app, you can manage and collect citations for books and articles across multiple devices from anywhere, anytime.  Use the mobile app to scan the ISBN barcode of a book or search for the book within RefME on the web.  Then sync your references with a reference management tool such as EndNote, Mendeley, Refworks, Zotero or BibTeX format. Create a personal account to sync and save your list of references with RefME or export your references to Microsoft Word or Evernote.   RefME also includes thousands of citation styles.