Resources from pluralism.org
About.com: Agnosticism / Atheism
Resources managed by Austin Cline, a regional director for the Council of Secular Humanism.
Founded in 1963 to labor “for the civil liberties of Atheists, and the total, absolute separation of government and religion” and has affiliated groups in more than 25 states.
American Ethical Union
“A humanistic religious and educational movement inspired by the ideal that the supreme aim of human life is working to create a more humane society.”
American Humanist Association
Maintains a network of over 100 grassroots organizations and publishes the bi-monthly magazine The Humanist.
Publishes Secular Nation magazine and The Freethought Directory, which lists freethought organizations around the world.
BBC – Religion and Ethics – Atheism
Provides an introduction to varieties of atheism and atheist thought.
Founded in 2003 to “promote the civic understanding and acknowledgment of the naturalistic worldview” and to “educate society toward accepting the full and equitable civic participation” of those who hold this worldview.
Center for Inquiry
Endeavors “to contribute to the public understanding and appreciation of science and reason, and their applications to human conduct.”
Freedom From Religion Foundation, Inc.
Educational group working for the separation of church and state that publishes the newspaper Freethought Today.
Humanist Chaplaincy at Harvard
Sponsors lectures and offers resources to help build and support “a diverse community of Humanists, agnostics, atheists, and the non-religious at Harvard.”
Institute for Humanist Studies
Resources include online courses in humanist thought and the Humanist Network News service.
No Beliefs: For Freethinkers
Offers resources with a focus on political issues affecting the freethought community.
Secular Student Alliance
Student-governed organization that works “to organize, unite, educate, and serve students and student communities that promote the ideals of scientific and critical inquiry, secularism, and human based ethics.”
Operated by the Internet Infidels, an online naturalistic group, whose resources include a News Wire service for freethinkers.
Collection of resources and publications on skepticism, including a Skeptic’s Dictionary with over 400 entries.