mediabiasfactcheck.com is useful for it's "factual" measure of sources, but the right-left spectrum is based on what Americans consider "right" and "left" -so what they consider "far left," outside America is probably just "left." They label a lot of international centrist media sources as "left" too. What they consider "least biased" is going to be straight up capitalist.
I mean...if we're being real...the only people who do legitimate fact checking are leftists. The right hates the truth which is why the constantly attack the media. The nice thing about MBFC is that the team is international and anyone, anywhere can challenge their conclusions. I tend to very much agree with their ratings on the large, well known media such as the BBC, CBC, Reuters, AP, etc.