Fake News Monitor is described as 'Get notified when you visit a website with news that is likely fake. Fake News Monitor provides an easy way to report fake news along with a Chrome extension to notify you of fake news when browsing'. There are three alternatives to Fake News Monitor for a variety of platforms, including Google Chrome, Linux, Mac, Windows and Firefox. The best alternative is B.S. Detector, which is both free and Open Source. Other great apps like Fake News Monitor are FiB (Free, Open Source) and StB (Free, Open Source).
B.S. Detector is a browser extension that warns users about unreliable news sources. It basically searches all links on a given webpage for references to unreliable sources, checking against a manually compiled list of domains.
The FiB Chrome extension analyzes your Facebook feed for a url, picture, and text's validity. It was built by four students as part of Princeton University's hackathon, with the challenge to solve Facebook's problem with fake news.