Factcheck is by far the most independent, clear eyed political site on the web. The people running it and writing for it are human and therefore have opinions, but the articles on the site itself espouse no political agenda, take no stand on any issue, do not in any way advocate for either candidate, and criticise the outlandish claims of both. All articles are meticulously footnoted and cited, campaigns are directly contacted and given a chance to explain or clarify whatever claim or statistic they made that is at issue.
I find it seriously disconcerting that people call it into question, not based on errors which any human can and does make, but on amorphous unsubstantiated claims and innuendo about political affiliations which anyone can make, no better than conspiracy theories.