Typically, "foreign law" will mean a single sovereignty's law, while "international law" refers to law between multiple sovereignties and is based on treaties and the like.
Non-profit joint effort by two Australian Law Schools. Allows you to search other countries', regions', and territories' Legal Information Institutes, as well as free databases of case-law, legislation, treaties, etc. from all over the world.
Project by NYU School of Law dedicated to disseminating foreign, comparative, and international legal research materials. Contains articles, summaries, guides, teaching resources, and tools for a variety of law subjects and jurisdictions. Is regularly updated.
A directory of organizations that are Members of the Free Access to Law Movement which links to their websites. Most regions have their own "Legal Information Institute" and many are listed here.
From the Institute of Advanced Legal Studies, a searchable database of information on significant multilateral and bilateral treaties with links to the full text, where available.
The United Nations' Library, the Dag Hammarskjöld Library, has compiled its own research guides on many substantive topics related to the UN itself with documentation, but also how to use UN tools to conduct legal research.
Official website of the European Union. Provides access to EU law documents, EU case law, the Official Journal of the EU, international agreements, and other related materials in the 24 official EU languages.
The International Criminal Court's online resource for retrieving legal sources related to international criminal law. The site also list tutorials for how to use the system.
Maintained by the Office for Democratic Institutions and Human Rights (ODIHR), which is part of the Organization for Security and Co-operation in Europe (OSCE). Contains ODIHR legal documents, but also legislation such as constitutions and criminal codes for the 57 participating States.
The Law Library of Congress has many materials that can assist with foreign or international law legal research.
An online publication that covers legal news and developments worldwide. Updated frequently and sources information from national legal documents and reliable press organizations. Filters available by date, topic, jurisdiction, and author.
Guides to international law topics as well as a helpful "Beginner's Guide" to Public International Law.
Guides to over 170 countries and regions with the purpose of informing on those countries' or regions' constitution, branches of government, legal guides, and general resources.