Data sets

Center for International Development at Harvard University (CID). Research Datasets
http://www.cid.harvard.edu/ciddata/ciddata.html
Publisher: Center for International Development. Harvard University (CID).

CESSDA (Council of European Social Science Data Archives)
http://extweb3.nsd.uib.no/cessda/home.html
Publisher: Council of European Social Science Data Archives

Groningen Growth and Development Centre. GGDC Data Series
http://www.ggdc.net/index-dseries.html
Publisher: Groningen Growth and Development Centre. University of Groningen

Medieval and Early Modern Data Bank (various databases)
http://www2.scc.rutgers.edu/memdb/database_list.html
Publisher: Rutgers University Libraries

National Bureau of Economic Research (NBER). Data.
http://www.nber.org/data/
Publisher: National Bureau of Economic Research (NBER)

National Statistics (U.K.)
http://www.statistics.gov.uk/statbase/TSDIntro.asp
Publisher: U.K.Office for National Statistics.

Penn World Table
http://pwt.econ.upenn.edu/
Publisher: Center for International Comparisons. University of Pennsylvania

Prices and Wages: Index to Websites
http://www.iisg.nl/hpw/link.php
Publisher: International Institute of Social History

WebEc Economics Data
http://www.helsinki.fi/WebEc/webecc8d.html
Publisher: WebEc

World Development Indicators
http://www.worldbank.org/data/
Publisher: World Bank