Treaties establishing the mandates and operation of major intergovernmental international organizations. Note that many historic treaties are also found in the Avalon Project's collection of historical documents.

Brill online e-books contains the former collections of Martinus Nijhoff.   Two parts of the collection are "Human Rights and Humanitarian Law" and "International Law".  This may offer content such as: International Tribunal on Law of the Sea; International Criminal Tribunal for Former Yugoslavia documents; Law and practice of the United Nations.