ICPSR offers a large set of statistical researches from different institutions and research centers, dealing with many social science topics, including raw data, methodological explanations and some related publications.
Led by the University of Wisconsin, ICPSR is a partnership among several universities and data processing firms
Raw data are available in several compressed formats fitting the most used statistical processing softwares. The site includes a series of integrated areas and databases
450,000 statistical files and 6,000 related publications about a wide range of areas concerning social sciences. Many surveys on several issues from very different sources are available. Detailed Eurobarometer research series are also retrievable
Statistical files covering a broad range of PS related issues, i.e. statistical series on international organizations, elite studies, institutions building process, etc.
The updating process is not formally scheduled, even though it appears to be quite frequent. The news announcements, prominently featured in the home page, are also available through a RSS Feeds subscription