From their press release:
The International Law Library contains over 80,000 searchable documents for free access. This includes over 25,000 decisions of International Courts and Tribunals, over 30,000 treaties and international agreements (including the League of Nations and UN Treaty Series), international law journals and law reform materials. These materials cannot be jointly searched elsewhere on the Internet. AustLII’s LawCite citator tracks where international cases, treaties and law journal articles have been cited.Have a look.