Climate Feedback - network of scientists investigating claims about and media coverage of climate change.
Factcheck -- nonpartisan and nonprofit, "aims to reduce the level of deception and confusion in U.S. politics"
Hoax-Slayer - debunks email and social media hoaxes; posts news about internet scams.
NPR Fact Check - National Public Radio's current and archived articles fact-checking statements of politicians.
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
SciCheck - sponsored by FactCheck.Orf, identifies false or misleading scientific claims.
Snopes -- well-respected website that gets to the bottom of urban legends and national rumors.
Truth Be Told - a non-profit, non-partisan, sponsored by Howard University’s Department of Media, Journalism and Film in the School of Communications, examines claims about the black community in public debate.
Washington Post Fact Checker - Award-winning fact-checking website, goal is to "truth-squad" statements made by elected officials and government leaders.