Long-established (1961) US based think tank with wide interests across international relations & international security. It's GeoEconomics Center offers interesting data & analysis in international political economy - https://www.atlanticcouncil.org/programs/geoeconomics-center/

US-based private, non-profit organization dedicated to advancing cooperation between nations and promoting active international engagement by the United States. Founded in 1910, its work is nonpartisan and dedicated to achieving practical results.

Respected Canadian institute, aiming to provide information about all aspects of international relations. Free access to publications.

UK's pre-eminent think tank for international relations

Statistics & datasets conveying aspects of a country's environment for making foreign policy, includes political, economic, social & cultural information. Country reports focusing on governance, conflict risk, fragile & failed states. Based at Carleton University.

Useful website for all things IR. Articles, book reviews, etc. Also has a growing list of open access books - https://www.e-ir.info/publications/
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Interesting Spanish project, combining measures of economic, military & soft power to estimate indices of countries relative influence on the global stage.

Foreign Policy was founded in 1970 with the intention of leading a root-and-branch rethink of how the United States engaged with other countries. FP continues to explain Washington to the world and the world to Americans. The website offers limited free access to articles and some other content like podcasts

Covers four broad areas: the Secretaries-General, Secretariat Departments, Peacekeeping Missions, and Predecessor Organizations. Some digitised

New site which aims to bring together in one place the resources (publications, voting records, speeches) from UNBISnet in a more user friendly and mobile friendly manner.

ODS has full-text, born-digital UN documents published from 1993 onward, including documents of the Security Council, the General Assembly, the Economic and Social Council and their subsidiaries. The database also includes scanned documents published between 1946 and 1993, including all resolutions of the principal organs, all documents of the Security Council and the General Assembly Official Records. Documents are available in the official languages of the UN

Constitutes a broad guide to UN resources. Full text of publications from the main committees (1993-), detailed voting record of UN members on resolutions of the General Assembly & the Security Council since 1946, and index to speeches made in the Security Council & the General Assembly since 1983.
On the Record documents the views of individual member states
UN Yearbook 1946/47-
See also the detailed research guide to UN documentation and the League of Nations Archives resource guide.

Developed by Thomas Biersteker & colleagues at the Graduate Institute of International & Development Studies (Geneva), the app provides an overview of all types of sanctions imposed by the UN in the post-Cold War period. It also includes their variations and specific modifications, and the language used by the Security Council to authorise the measures, as well as impact (low, medium, high).

Queryable database of all verbatim statements given by the representatives of member states, 2010-2017

List of all vetoes 1946- with links to documents

Search engine for official statements & press releases of UN member states

Website from diplomacy academic G.R. Berridge has some useful blog posts & suggestions for primary sources

Annual ranking (2017-) from Higher Education Policy Unit in the UK, indicating in which country world leaders were educated

Lowy Institute for International Policy produced an interactive map which looks at the global diplomacy networks of 66 nations. It ranks influence in different regions and over time since 2016

Available through the UN Digital Library, it lists the representatives of Member States to the United Nations from 1946- onwards. The current version can be accessed at: https://www.un.org/dgacm/en/content/protocol/blue-book

Analyses use of social media by world leaders & international organisations.

Maintained by the US Department of State. A searchable database of information about the location and content of national diplomatic archives worldwide.