The Pew Research Center is a major center for the study of public opinion and regularly conducts polls (both at home and abroad) about various social and political topics and contemporary issues. They make many of their studies available for download here. Many of the more recent data files are in SPSS format. Users are required to register before downloading a dataset, but registration is free.
1973-present. Huge database of citations to statistical publications from U.S. federal and state governments, international agencies, nonprofit and educational institutions, and private publishers including trade and industry groups. Full text of the publication or report is often included, and many tables are downloadable in Excel. Particularly good for demographic and country-level information. Previous name Statistical Universe.
As of 2020, subscription includes:
Statistical Insight Tables
Statistical Insight Statistical Reference Index Full Text
Statistical Insight American Statistics Index Abstracts and Indexing ONLY (no current full text)
ProQuest Statistical Insight IIS Abstracts and Indexing Web Service (no current full text)
ProQuest Statistical Insight SRI Abstracts and Indexing Web Service
From the U.N.'s Economic Commission for Europe. Site brings together both gender statistics and policies. Main focus is on the production, dissemination and use of gender related data. Includes Gender Statistics Database.