The folks at NoClip Docs make a great deal of interesting feature films. They're 100% crowdfunded and quite niche - in a good way!

The above film - The History of Grand Theft Auto, Lemmings & DMA Design - actually came out 2 years ago but I think it's likely timeless content. I had no idea that the studio that made Grand Theft Auto also made Lemmings. I have not consumed the entire 72 minute film but I'm looking forward to it.