These 22 free tools judge the veracity of information and information sources. They can be used to filter news or to check on the legitimacy of a news article. Some of these tools make informed judgments of content, while others simply categorize content based on standardized indicators of bias.

AllSides: Media bias ratings and rated news articles.

BS Detector: A Chrome and Mozilla browser extension that searches all links on a given webpage for references to unreliable sources, checking against a manually compiled list of domains.

CounterAction: The George Washington University’s effort to gauge indications of bot activity and other factors behind news articles.

Clogosphere: RationalWiki’s “snarkilicious” list of fringe blog postings.

Digital Forensics Research Lab: The Atlantic Council’s digital forensic analysts tracking events in governance, technology, security, and where each intersect as they occur.

EasyList: A regularly updated list of problematic ad originators and malware originators.

EU vs Disinfo: Stratcom’s assessments of mostly Russian disinformation activities.

FactCheck: The Annenberg Foundation’s selective assessments of false claims in the news.

Fact Checker: The Washington Post’s selective assessments of false claims in the news.

False, Misleading, Clickbait-y, and/or Satirical “News” Sources: A list of known false websites (needs updating).

Flipside: A Huffington Post project that places news articles on a liberal-to-conservative continuum.

Google News fact-checking: Provides a label to fact-checked articles in news.google.com searches.

List of conspiracy theories: A long list of current conspiracy theories, aggregated on RationalWiki.

Media Bias/Fact Check: A Chrome extension that classifies information sources based on reporting bias.

Myth Detector: A Europe-based site primarily assessing Russian disinformation activity.

NewsGuard: A Chrome and Edge browser app offering assessments of information sources’ reliability.

Politifact: The Poynter Institute’s non-partisan fact-checking of journalistic information sources.

SmartNews: An app that uses machine learning to check news sources for diversity of opinion, readership, and categorization.

Snopes: Conducts after-the-fact research into possible online hoaxes.

TrustedNews: A Chrome extension that uses Snopes and Politifact information to grade news sources.

TruthorFiction: An independent site conducting select investigations of misinformation.

Wikitribune: Crowdsourced, fact-checked news articles.