American Philosophical Association
A guide to web resources.
BUBL LINK
Large classification system for internet sources.
Stanford Encyclopedia of Philosophy
Non-profit project for a major encyclopedia.
Philosophy Pages
Resources include a number of useful resources and study guide.
Episteme Links: Philosophy Resources on the Internet
Thousands of links to other resources.
Internet Encyclopedia of Philosophy
Searchable database of basic information and definitions.
Philosophy Research Base
Annotated directory of thousands of resources covering most areas.