For a complete list see:
http://ubwebsites.com/
http://www.trinityconcept.com/
http://en.wikipedia.org/wiki/The_Urantia_Book
http://www.urantology.org/index.html
http://themichaelsfoundation.com/
http://www.ubthenews.com/index.htm
http://www.retreatnetwork.com/
http://www.rebuildthegarden.com/Home_Page.html
http://www.ubhistory.org/UBHS/AboutUs.html
http://encyclopediaurantia.org/
http://www.virtualurantia.com/index.html
http://www.perfectinghorizons.org/
http://www.urantiafamily.org/
http://www.urantiawiki.org/wiki/index.php?title=Main_Page
http://www.urantiaproject.com/
http://www.personal.kent.edu/~jwattles/ub.htm