Composition as Identity
Catherine Sutton's resource page dedicated to the problematical thesis that a thing is identical to its parts.

The Determinism and Freedom Philosophy Website
Ted Honderich's collection of resources on this recurring theme.

Metaphysics
Papers from the 20th World Congress of Philosophy.

Metaphysics: Multiple Meanings
A good bunch of metaphysical links and an introductory article.

Metaphysics Research Lab
Links, articles and tutorials.

Ontology
Papers from the 20th World Congress of Philosophy.

Ontology. A Resource Guide for Philosophers.
Collated by Raul Corazzon.

Ontology - The Buffalo Ontology Site
Some good links for ontology and knowledge engineering from the University of Buffalo.

Process Thought - Proceedings of the Japan Society for Process Studies
In Japanese and English. Includes the A N Whitehead database.

The Void and Emptiness Site
Explores concepts of the void and emptiness from various perspectives: philosophy, science, art, religion...

Why Does Anything Exist?
A good question and an interesting website.

JE McTaggart: The Unreality of Time
Influential essay first published in Mind 17 (1908), now hosted by Digital Text International.