Opinio Juris
Opinio Juris is a blog devoted to international law and international relations. Its posts seek 'to describe and analyse international law where it is most controversial and ambiguous.' It was established in 2005 by Chris Borgen of St. John's University Law School, Peggy McGuinness of the University of Missouri Law School and Julian Ku of Hofstra Law School; since 2018 it has been run in partnership with the International Commission of Jurists. The blog can be browsed by region or by topic.