Americans Against World Empire, Americans Against Bombing

Conservative/libertarian coalition opposed to military imperialism and particularly the blockading and bombing of nations who have done the US no harm. Regularly updated, news analysis.
http://www.iraqwar.org

Anti-Intervention Network

Coalition of groups and individuals who oppose all U.S. military intervention, anywhere in the world. Mission statement, calls to action, membership information, and directory of participants.
http://www.oz.net/~vvawai/ain-home.html

Antiwar.com

News, viewpoints, activities, and articles on various flashpoints around the world. Archive available.
http://www.antiwar.com

The Smedley Butler Society

Arbitrary and expensive wars, for corporate profit, constitute a racket according to General Smedley Butler, USMC, therefore people must be mobilized to support a Constitutional amendment to end war.
http://warisaracket.org