Very many judicial decisions concerning international law are now freely available. Domestic legal decisions may be found on national sites and the following links contain judgments given before international tribunals.
International Court of Justice (ICJ)
www.icj-cij.org
International Tribunal for the Law of the Sea (ITLOS)
www.itlos.org/
European Court of Human Rights
www.echr.coe.int
International Criminal Court
www.icc-cpi.int