A selection of websites on international treaties:
A. Travaux Préparatoires
À la Recherche des Travaux Préparatoires: An Approach to Researching the Drafting History of International Agreements
Guide on searching for travaux préparatoires. Published by Jonathan Pratter (Foreign and International Law Librarian, Tarlton Law Library)
Audiovisual Library of International Law: Historic Archives
Contains an introduction on a particular legal instrument, information on its procedural history and related documents (including travaux préparatoires) as well as the text and status of the instrument.
Collected Travaux Préparatoires
The Lillian Goldman Law Library (Yale Law School) has collected Travaux Préparatoires for international treaties that are available online or listed in its library catalogue.
What are Travaux Préparatoires and How Can I Find Them?
This website lists sources one can use to locate travaux préparatoires for UN multilateral treaties. Published by the Dag Hammarskjöld Library.
B. Treaty Texts
Avalon Project: Documents in Law, History and Diplomacy
Digital library of documents dating as far back as 4000 BCE. Developed and maintained by the Lillian Goldman Law Library, Yale Law School.
CIL Document Database
Database administered by the Centre for International Law (National University of Singapore) containing over 1000 ASEAN and international law documents in areas relevant to CIL’s research.
Core International Human Rights Instruments
Texts, ratifications and reservations of the 9 core treaties. Published by the Office of the United Nations High Commissioner for Human Rights.
Council of Europe: Treaty Office
Full texts of all conventions and agreements in the European Treaty Series (ETS) and Council of Europe Treaty Series (CETS). Published by the Council of Europe.
Searchable database of multilateral environmental treaties. Jointly operated by the FAO, IUCN and UNEP.
ICRC: Treaties, States Parties and Commentaries
Database containing treaties relating to international humanitarian law. Managed by the International Committee of the Red Cross.
Standards published by the International Labour Organization.
Language of Peace
Database "provides easy access to compare and collate language on key issues across 75,000+ provisions of around 1,000 peace agreements."
Space Law Treaties and Principles
UNOOSA publishes full texts of the space treaties and principles as well as selected travaux preparatoires
Conventions drawn up by the International Institute for the Unification of Private Law (UNIDROIT) and adopted at diplomatic conferences convened by member States of UNIDROIT. Click on "Instruments" on the left panel to activate the drop down menu for the full list of treaties.
United Nations Treaty Collection
Access to the United Nations Treaty Series and Multilateral Treaties Deposited with the Secretary-General. Also includes publications like the Treaty Handbook and Final Clauses of Multilateral Treaties Handbook.