The Principal Court of the United Nations. "The Court’s role is to settle, in accordance with international law, legal disputes submitted to it by States and to give advisory opinions on legal questions referred to it by authorized United Nations organs and specialized agencies."
https://www.icj-cij.org/en/court
The following materials contain full text cases from the International Court of Justice (For historical decisions from the ICJ's predecessor - prior to 1947- see 'Permanent Court of International Justice" at the bottom of this page):
The following materials contain digests (and is some cases full text) of cases from the International Court of Justice:
"[I]nvestigates and, where warranted, tries individuals charged with the gravest crimes of concern to the international community: genocide, war crimes, crimes against humanity and the crime of aggression. As a court of last resort, it seeks to complement, not replace, national Courts"
https://www.icc-cpi.int/about
The following materials contain full text cases from the International Criminal Court:
The following is a selected list of links to various war crime tribunals. For decisions from other tribunals, as well as links to decisions from various human rights commissions, go to the World Courts site at : http://www.worldcourts.com/index_subject.htm
Browse to the "Human Rights" and "Criminal" categories.
The following materials contain full text cases from the Permanent Court of International Justice (the ICJ's predecessor):