A searchable index to works of both well-known and little-known philosophers on various philosophical topics throughout the web. http://www.hku.hk/philodep/directory/
Proceedings of the 20th World Congress of Philosophy. The main index for the archive of contributed papers; ongoing contributions. http://www.bu.edu/wcp/PaidArch.html
Research bibliographies, books, art, music, science, theater, and cinema with links to 1,100 interdisciplinary entries compiled by Russell McNeil. http://www.mala.bc.ca/~mcneil/
Marxists.org collection of texts from the history of philosophy tracing the development of ideas on the relation between consciousness and matter; includes 120 philosophers over the course of 400 years. http://www.marxists.org/reference/subject/philosophy/front_pg.htm
The Galilean Library is an expanding collection of essays on the sciences and humanities alongside a discussion forum, webblog and bookstore. http://galilean-library.org