CFI Transnational – http://www.centerforinquiry.net/
CFI Transnational is the umbrella organization for Centre for Inquiry. It acts to promote reason, science and secularism in the US and around the world.
The Canadian Secular Alliance http://secularalliance.ca/
The Canadian Secular Alliance is a non-profit, public policy research organization advancing church-state separation and the neutrality of government in matters of religion.
James Randi Education Foundation – http://www.randi.org/site/
The James Randi Educational Foundation is an educational charity which works to help people defend themselves from paranormal and pseudoscientific claims.
Atheist Alliance International – http://www.atheistalliance.org/
Atheist Alliance International (AAI) is a global federation of atheist and freethought groups and individuals committed to educating its members and the public about atheism, secularism and related issues.
Humanist Canada – http://humanistcanada.ca/
Humanist Canada works to promote the separation of religion from public policy and foster the development of reason, compassion and critical thinking for all Canadians through secular education and community support.
Secular Coalition for America – http://secular.org
The Secular Coalition for America is an advocacy organization whose purpose is to amplify the diverse and growing voice of the nontheistic community in the United States. Their staff lobbies U.S. Congress on issues of special concern to US freethinkers.