Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Workona - A better way to work in the browser.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Session Buddy - Manage Your Browser Sessions
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Toby - Better Than Bookmarks