Google Dataset Search
Google's Dataset Search offers a simple interface to look for data, and includes data from publisher's sites, digital libraries, and personal web pages.
ICPSR Inter-University Consortium for Political and Social Research This link opens in a new window
ICPSR is the world's largest archive of computer readable social science data in education, aging, criminal justice, substance abuse, terrorism, and other fields.
OECD iLibrary This link opens in a new window
OECD iLibrary is the online library of the Organisation for Economic Cooperation and Development (OECD) featuring books, papers and statistics and is the gateway to OECD’s analysis and data. It replaced SourceOECD in July 2010. OECD iLibrary also contains content published by the International Energy Agency (IEA), the Nuclear Energy Agency (NEA), the OECD Development Centre, PISA (Programme for International Student Assessment), and the International Transport Forum (ITF).
Roper Center Public Opinion Archives This link opens in a new window
The Roper Center is a public opinion archive that preserves the data from polls conducted by many leading survey organizations. Most of the data are from the United States, but over 50 nations are represented. The iPOLL databank offers access to nearly half a million survey questions and answers asked in the U.S. by more than 150 survey organizations. Direct links are given to study documentation and datasets.
Social Media Data Tools - LSE Impact Blog
The London School of Economics produces an Impact Blog, focused on academic research impact. This post from June 2019 details methods and many popular research tools for social media analysis.