FactCheck.org - A "nonpartisan, nonprofit" research center out of the University of Pennsylvania. Their funding information and funding disclosures are on their "Our Funding" page. An RSS feed from this website is available in the right column -->
PolitiFact - From the Tampa Bay Times, this fact-checking website won a Pulitzer Prize in 2009.
Snopes.com - Billing itself as "the definitive Internet reference source for ... misinformation", Snopes.com double-checks a wide range of claims, from urban legends to Internet rumors.
AP Fact Check - from the Associate Press news. .
What Comes Next? A Resource Guide zine (and call to action) from Hunter College Libraries. How to think critically about your information sources
Guide to Fact checking, Verification and Fake News from the CUNY Graduate School of Journalism