Philosophy
- Philosophica (Enciclopedia filosófica) (Spanish)
- Corpus Thomisticum (Aquinas in Original Latin!)
- The Summa Theologiae of St Thomas Aquinas (by New Advent)
- Thomas Aquinas, Summa Contra Gentiles (Latin-English) [ADDED 13-Nov-2013]
- Thomas Aquinas, Summa Contra Gentiles (English) [ADDED 13-Nov-2013]
- The Aquinas Translation Project (Niagara University)
- Aquinas Online (with exhaustive bibliography)
- Center for Thomistic Studies (Australia)
- Thomistic Philosophy Page from the University of St. Thomas (Houston)
- Reginald Garrigou-Lagrange. Reality--A Synthesis of Thomistic Thought (EWTN)
- Reginald Garrigou-Lagrange. A Synthesis of Thomistic Thought (Catholic Apologetics--different from EWTN)
- The American Catholic Philosophical Association
- Ralph McInerny Home Page
- Patrick and John's Aquinas Cafe
- Ethics and Public Policy Center
- Jacques Maritain Center
- International Catholic University: Online Courses
- Radical Academy
- Peter Kreeft Home Page
- Philip J. Porvaznik (Articles on Philosophy and Science)
- Edward Feser (Blog)