Factcheck -- nonpartisan and nonprofit, "aims to reduce the level of deception and confusion in U.S. politics"
Politifact-- sponsored by the Tampa Bay Times, an independent newspaper, this website "checks claims by elected officials, candidates, leaders of political parties and political activists."
Pundifact -- also sponsored by the Tamba Bay Times, specifically checking claims made by "pundits" or the so-called experts and opinion makers frequently interviewed on news programs
Snopes -- well-respected website that gets to the bottom of urban legends and national rumors.
