HDX is managed by OCHA's Centre for Humanitarian Data, which is located in The Hague. OCHA is part of the United Nations Secretariat and is responsible for bringing together humanitarian actors to ensure a coherent response to emergencies.
The Inter-university Consortium for Political and Social Research has data on various social science topics. You can browse datasets based on topic, series, or based on theme. ICPSR also has learning guides based on a certain dataset.
Our World in Data and the SDG-Tracker are collaborative efforts between researchers at the University of Oxford, who are the scientific editors of the website content; and the non-profit organization Global Change Data Lab
Data Planet is a compendium of datasets in which you can search for various type of data by subject such as government, food, or economics. In addition, you can search by data source from a variety of national and international organizations. You have to use the proxy server in order to access this data.
The CWSDS is a joint effort by comparative welfare-state scholars such as Evelyne Huber, Charles Ragin, John D. Stephens, and Duane Swank. The data cover 18 OECD countries from 1960 onwards and include many economic, political, and policy variables, including the structure of political institutions and of wage-bargaining institutions.
The CPDS were produced by scholars at the University of Berne. They are similar to the Database of Political Institutions dataset but focus on OECD countries and post-communist countries and have more emphasis on demographics, electoral results, and ideological compositions of governments. Related datasets are also available for post-communist countries and for countries that are members of the OECD and/or the European Union. Please note the authors' preferred citation format.