A dynamic online reference work authored, edited, and maintained by experts in the field. It includes substantive essays on many different topics, people, and periods in the field of philosophy. Each essay is followed by a bibliography on the topic, links to related entries, and citation information. This is a good example of "open access" scholarship, a free internet resource that meets exacting scholarly standards.

PhilPapers is a comprehensive index and bibliography of philosophy maintained by the community of philosophers. It monitors all sources of research content in philosophy, including journals, books, open access archives, and personal pages maintained by academics. It also hosts the largest open access archive in philosophy. Their index currently contains 2,701,186 entries categorized in 5,842 categories.

An excellent open access scholarly resource with substantive articles on a wide range of philosophical topics and figures. It is produced through a peer review process, and articles are written and reviewed by scholars in their particular field.