EpistemeLinks
Includes over 19,000 categorized links to philosophy resources on the Internet and has several additional features. Online since early 1997, this site is free to use, and doesn't require user registration.
Erratic Impact Philosophy Research Base
Categorized by history, subject and author. Integrating text resources with the best online resources, this study guide attempts to aid both academic and general interest in all philosophical genres and their related fields.
Ethics Updates
Designed primarily to be used by ethics instructors and their students. It is intended to provide resources and updates on current literature, both popular and professional, that relates to ethics.
Intute: Philosophy
Provides free access to high quality resources on the Internet. Each resource has been evaluated and categorised by subject specialists based at UK universities
Noesis A limited area search engine for open access, academic philosophy on the Internet.