Organizations

Atheist Alliance International
Organization of religion-free groups and individuals around the world. Aims to promote democratic, atheistic societies. Includes essays, information about conventions and publications, and a directory of freethought groups throughout the world.
http://www.atheistalliance.org/

Church of Reality
Dedicated to understanding reality the way it really is.
http://www.churchofreality.org/

Ethical Atheist
Group resisting religion's influence while promoting a scientific and nonreligious worldview. Features articles and forums.
http://www.ethicalatheist.com/

Military Association of Atheists and Freethinkers
Grassroots organization that exists to provide a forum for United States service members to express their views and find a community of like-minded individuals. Articles, news, how to become a member, and frequently asked questions.
http://www.maaf.info/