Film and documentary fans out there may not be aware of it, but the British Film Institute has a fantastic free resource available. Their BFI film player is free to download, and contains a wealth of free to view films and documentaries, easily streamed to your PC or any compatible device.
They also have a vast catalogue of pay-to-view films, which can be watched for a reasonable fee over a set time period. These include many World Cinema offerings, as well as up to date cinema releases. Their archive is second to none, and the documentaries range from the earliest days of film, through to family-shot cine films covering most decades.
I have no connection with this organisation, but cannot recommend this highly enough. All you have to do is create an account, download the BFI player, and choose what to watch. No card details are required, as they can be added later if you do choose to pay to watch something. Check out these links, and see what you think. I doubt you will regret it.
I apologise in advance to international readers if this service is not available in your country.