DocumentaryTube sorts documentaries the ways people look for them — by what they are about, when they were made, where they come from and who directed them — newest first. Every film's facts come from the open film record (Wikidata), with its Wikipedia description when it has one; each page says where its facts came from and when they were read.
The Screening Room is DocumentaryTube's blog: full documentaries to watch free, "best documentaries about" guides, and news from festivals and premieres. Where it has a film in full, the film's page says so.
The services that stream documentaries and teaching films are ranked on what each publishes about itself; how is on how DocumentaryTube ranks, and how the site is paid on the advertising disclosure.
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