Sponsored by Washington University, St. Louis, this online dictionary is "intended as a free resource for all those interested in the philosophy of mind." (Quoted from site.) Uses Google to search for term(s), but also has an alphabetical index with a letter by letter display of topics plus a section of brief biographies.
"The Ism Book is an intellectual field guide that provides brief definitions of theories, doctrines, movements, and approaches in philosophy, religion, politics, science, the arts, and related disciplines." (ISM Web site).