"The Economic History Association was founded in 1940. Its purpose is to encourage and promote teaching, research, and publication on every phase of economic history, broadly defined, and to encourage and assist in the preservation and administration of the materials for research in economic history."
"Present in over 107 countries and territories and with over 50,000 members, AIESEC is the world’s largest student-run organisation. AIESEC offers young people the opportunity to be global citizens, to change the world, and to get experience and skills that matter today."
The IEA strives "to promote personal contacts and mutual understanding among economists in different parts of the world through the organisation of scientific meetings, through common research programmes and by means of publications of an international character on problems of current importance."
"The aims of the IEHA are to maintain and develop personal contacts between scholars interested in economic history and to encourage all forms of research and publications relevant to the development and diffusion of economic history."
A list of links to the web sites of central banks (U.S. Federal Reserve, Deutsche Bundesbank, etc.), from the Bank for International Settlements. Many of these have free online access to statistical publications and working papers.
NBER promotes and distributes "unbiased economic research among public policymakers, business professionals, and the academic community." Its four goals are to develop new statistical measurements, estimate quantitative models of economic behavior, analyze the effects of public policies on the US economy, and predict the effects of alternative policy proposals. Especially useful is their Data Page and Working Paper Archive.