Hoover Institution

A think tank on the campus of Stanford University, dedicated to research in domestic policy and international affairs, committed to generating ideas that define a free society.
http://www.hoover.org

Heritage Foundation

A conservative think tank that publishes research on domestic, economic, foreign and defense policy.
http://www.heritage.org/

Heartland Institute

Chicago based think tank promoting public policy based on individual liberty, limited government, and free markets.
http://www.heartland.org

Hudson Institute

A public policy research organization that forecasts trends and develops solutions for governments, businesses and the public. Addresses domestic and international policy issues.
http://www.hudson.org/