Really it doesn't matter what sites I list, because they are all shit. The very act of calling themselves "fact checkers" should give it away. Just pick any of them and read their "checks" with a critical mind. Anybody can call themselves a "fact checker", it is a fake claim to authority.
Isn't Snopes also a renowned "fact checker"? I think some scandals regarding their founders came to light recently, but I don't remember the details.