- Philosophers Index (Colby only)
- Stanford Encyclopedia of Philosophy
- Routledge Encyclopedia of Philosophy
- Internet Encyclopedia of Philosophy – A non-profit organization publishing scholarly information on key topics of interest in all areas of philosophy
- American Philosophical Association (APA) – The American Philosophical Association is the main professional organization for philosophers in the United States.
- The Daily Idea – Includes hundreds of free, online Philosophy resources organized by topic.
- The Philosophical Gourmet Report – 04-09 – A ranking of Graduate Philosophy Programs in the English speaking world.
For further research information, please visit Colby College Library Philosophy Research page.