Institute Vienna Circle: Dedicated to continuing the Circle's work in the philosophy of science. In German and English.
Internet Encyclopedia of Philosophy: Vienna Circle: Article by Mauro Murzi.
Moritz Schlick and Vienna Circle Foundation: Introudces the archive of the Vienna Circle Foundation in Haarlem, Netherlands, particularly regarding the works of the philosophers Moritz Schlick adn Otto Neurath.
Wikipedia: Vienna Circle: Article from this openly-edited encyclopedia.