- Association of American Educators
- Ballotpedia
- Bill of Rights Institute
- Communism: Its ideology, its history and its legacy (a resource developed by teachers for teachers)
- Foundation for Economic Education
- Foundation for Teaching Economics
- Historical Documents
- Honest Reporting
- Institute for Energy Research
- Junior Achievement
- Middle East Forum
- Middle East Media Research Institute
- RealClearPolitics.com (U.S.) (commentaries from the left and right)
- RealClearWorld.com
- SixDayWar
- Tax Foundation
- Victims of Communism
- The Witness Project (videos of the victims of communism, past and present)