United Nations http://www.un.org provides a huge array of UN-related resources, including UN resolutions and minutes of meetings.

International Court of Justice http://www.icj-cij.org gives details of how the Court is structured, how it works, and details and materials relating to past and present cases.

International Criminal Court http://www.icc-cpi.int/ provides details of how the Court is structured, how it works, and details and materials relating to past and present cases.