Data

United States Federal Government clearinghouse for linked, open government data.

ICPSR maintains a data archive of more than 500,000 files of research in the social sciences. It hosts 16 specialized collections of data in education, aging, criminal justice, substance abuse, terrorism, and other fields.

IPUMS provides census and survey data from around the world integrated across time and space. IPUMS integration and documentation makes it easy to study change, conduct comparative research, merge information across data types, and analyze individuals within family and community contexts. Data and services available free of charge.

Contains a standard 'core' of demographic, behavioral, and attitudinal questions, plus topics of special interest since 1972 to facilitate time-trend studies as well as replication of earlier findings.

Google's dataset search engine enables users to search 25 million publicly available datasets. The search tool includes filters to limit results, and the results include the dataset description and citation.

The World Bank provides free and open access to a comprehensive set of data about development in countries around the globe.

Online polling platform founded in 2000.