The Congressional Research Service is an agency of the Library of Congress which provides detailed background information for members of Congress and their staff. Inquiries direct from the public are not accepted and they will refer people to their congressional office or local library. Selected reports have been made available on the web by various organizations.
See also: GAO (General Accounting Office) Reports
University of North Texas CRS Reports (Browse reports)
CRS Reports from the State Department (Foreign Relations)
CRS Reports on Science - Federation of American Scientists
Agriculture & Food Issues - National Agricultural Law Center
It’s not perfect, but you can find a wide variety of CRS reports on the US House of Representatives Web site. Do a search for CRS and [keyword].
ex: crs and medicare or crs and acorn
CRS Reports from Gallagher Library, University of Washington
Meta-site: They link to other providers of CRS reports.
CRS Reports on the Environment - National Council for Science & the Environment
Currently not working (3/8/2017)
CRS Reports on Global Security - GlobalSecurity.org