Argumentação e Lógica

• Informal Fallacies
• Mission Critical
• Peter Suber's Logical Systems
• Stephen's Guide to the Logical Fallacies
• The Nizkor Project

Astronomia e Astrofísica

• Amazing Space Web-based Activities
• Apod Index
• Associação Portuguesa de Astrónomos Amadores
• Astronomy Picture of the Day
• Astronomy Resources at STScI
• Earth from the Space
• Exploration in Education
• Hubble Space Telescope
• Nasa Origins Program
• Pedro Ré's CCD Imaging Page
• Seti@home
• Stephen Hawking

Dicionários e Enciclopédias

• Dictionary of Philosophy of Mind
• Routledge Encyclopedia of Philosophy
• Stanford Encyclopeadia of Philosophy
• The Catholic Encyclopedia
• The MIT Encyclopedia of Cognitive Sciences

Educação e Filosofia

• Côtéphilo

Filosofia ― Geral

• TPM Online

Filosofia da Arte

• Aesthetics
• Aesthetics and Philosophy of the Arts
• Africans Art
• Estetica
• International Institute of Aesthetics
• Learning About Art
• Home Page for Professor Jeff Strayer
• The Art Renewal Center

Filosofia da Religião

• Analytic Philosophy of Religion
• Critical Thought and Religious Liberty
• Faithquest
• Michael Sudduth's Natural Theology Website
• Origins
• Philosophy and Religion
• Philosophy of Religion
• The Atheist Alliance
• The Secular Web
• Western Theism

Páginas Pessoais de Filósofos

• Elliot Sober's Home Page
• Gensler's Home Page
• João Branquinho
• John Perry
• Michael Tooley's Philosophy Home Page
• Simon Blackburn's Web Page
• Ted Honderich

Pensamento Crítico

• American Humanist Association
• ASP Astronomical Pseudo-science A Skeptic's Resource List
• Astrology & Science
• British Humanist Association
• butterfliesandweels.com
• CEPO
• CSICOP On-line Scientifically Investigating Paranormal and Fringe Science Claims
• Laboratoire de Zététique
• Skeptical Information Links
• Skeptic News The What's New Page for Skeptics
• The Skeptic's Annotated Bible
• The Skeptic's Dictionary
• The Skeptic Report - We're the Bad Guys

Diversos

• Arts & Letters Daily
• Ciência Viva
• Fundação para a Ciência e Tecnologia
• Marxists Internet Archive
• The Bertrand Russell Archives
• The Bertrand Russell Peace Fundation
• The Bertrand Russell Society
• The Nobel Prize in Literature 1950
• The Russell-Einstein Manifesto
• Willard van Orman Quine Home Page