SSRN makes recent research in the social sciences available quickly. You can find working papers and pre-publication journal articles available full text. If the text you want is not available for download, contact the author and ask if a copy can be sent.
This institutional repository for the London School of Economics and Political Science contains articles, book chapters, books, working papers, conference papers and more authored by LSE staff
Users can access timely, updated information from over 350 U.S. public policy think tanks, nongovernmental organizations, research institutes, university centers, advocacy groups, and other entities. Coverage is from 1990 to the present. Can provide better results than searching Google.
Search of think tank websites sponsored by the Harvard Kennedy School. Includes a mix of non-partisan and partisan due to organizations' impact and reputation.