America's Real Religion, by Gene Garman
- http://www.sunnetworks.net/~ggarman/
- Provides primary sources for quotations from Benjamin Franklin, George Washington, Thomas Paine, John Adams, Thomas Jefferson, James Madison, and Abraham Lincoln regarding their personal religion and regarding religion's proper relationship to government.
Citizens Project
- http://www.citizensproject.org/
- A grassroots organization in the Pikes Peak [Colorado] region dedicated to upholding the traditional American values of pluralism, freedom of religion and separation of church and state.
Freedom From Religion Foundation, Inc.
- http://www.ffrf.org/
- National organization of freethinkers (atheists, agnostics) in Madison, Wisconsin, working to keep state and church separate and to educate the public about the views of nontheists.
Jefferson 21st Century Institute
- http://www.j21c.org/
- Dedicated to the separation of religion and government. Focuses primarily on constitutionally questionable actions by, or on behalf of, small religious movements.
Liberty Magazine
- http://www.libertymagazine.org/
- Dedicated to the preservation of the separation of church and state with an emphasis on the Establishment and Free Exercise clauses of the US Constitution. Online version includes archived versions beginning with the May/June 1997 issue.
Religion vs. Morality
- http://religion.aynrand.org/
- The Ayn Rand Institute's views on separation, with quotes from the founding fathers of the US, and commentary on some related issues such as abortion and evolution.
Texas Freedom Network
- http://www.tfn.org/
- Advances an agenda of religious freedom and individual liberties primarily to counter efforts of conservative political and religious groups. News and issues information, particularly for the US state of Texas.