Web Reference - Browse by Category
Associations & Societies
Searchable directory of more than 6,500 associations.
Convenient source of ready-reference information on a selected number of nongovernmental organizations (NGOs)--organizations worldwide that are not part of any government, such as nonprofit associations and groups affiliated with the UN or EU.
A meta-site for think tank links from around the woe=rld compiled by the University of Michigan.
Societies worldwide and across all disciplines.
A Google Custom Search of more than 590 think tanks and research centers.