Snopes
Started in 1994, Snopes initially investigated urban legends, hoaxes, and folklore and then expanded its scope to fact-checking and original investigative reporting to "evidence-based and contextualized analysis."
Media Bias/FactCheck
Founded in 2015, MBFC is an independent online media outlet dedicated to educating the public on media bias and deceptive news practices. Their aim is to examine overtly biased media which entails following a strict methodology for determining the biases of sources.
Politifact
A fact-checking website that rates the accuracy of claims by elected officials in American politics. Owned by the Poynter Institute, which also operates the International Fact Checking Network (IFCN) that sets standards for fact checkers.
FactCheck.org
A "nonpartisan, nonprofit 'consumer advocate' for voters that aims to reduce the level of deception and confusion in U.S. politics" The site monitors the " factual accuracy of what is said by major U.S. political players in the form of TV ads, debates, speeches, interviews and news."
Lead Stories
Launched in 2015, this site is a fact-checker and hoax/rumor debunker. The site uses a specific engine called the Trendolizer, which tracks story trends that allows this site to quickly debunk fake news before they become viral. Their mantra: "Just because it's trending doesn't mean it's true."
Science Feedback
Consists of two separate websites, Climate Feedback, which reviews climate- related claims and Health Feedback, which reviews health and medical claims.
AP Fact Check
Fact-checking and accountability journalism from AP journalists around the globe.
AFP (Agence-France Presse)
Launched its digital verification service in France in 2017 with journalists in countries from the United States to Myanmar. They work with AFP’s bureaus worldwide to investigate and disprove false information, focusing on items which can be "harmful, impactful and manipulative." They frequently fact-check fake photos and videos as well. Some consider it the best English language fact-checker for non-USA fact-checks.
Full Fact
An independent nonprofit IFCN fact-checker based in the United Kingdom. Their focus is on political claims and misinformation published by the UK media. Full Fact is the UK’s version of Politifact.
Open Secrets
Nonpartisan, independent and nonprofit, run by the Center for Responsive Politics, which is the nation’s premier research group tracking money in U.S. politics and its effect on elections and public policy. They also track lobbying groups and whom they are funding.
Conclusion of Reporters' Lab– A good fact checking service will write with neutral wording and will provide unbiased sources to support their claims. Look for these two simple criteria when hunting for the facts.