I try pretty hard to stay informed on GWOT and geopolitics in general, but often get confused with the names of the various jihadi nutjob organizations. I recently came across the site linked to below. They seem, to my layman's eye, to have a relatively comprehensive data base with brief profiles of the various terror groups. I don't know anything more about them, and have not looked much beyond the database of terror groups.
http://www.tkb.org/Home.jsp
HTH