Fans making their own non-profit works based on what they love.
I first learned of the idea via Batman. Stumbling upon Dead End and Death of Batman via IMDB back when Batman begins wasn't quite out yet. A good Website for these classic Batman Fan Films would be BatmanFanFilms.com it still exists but it's forum seems basically dead. I like films like Patient J and Law & Order Gotham.
That website doesn't include a lot of YouTube projects. Like best of all The Joker Blogs. Which seemed dead but just made a comeback.
But going outside Batman. last year I really loved Sailor Moon The Movie. It's a American set Adaptation of the first Season of the old Anime. It uses the old DiC dub names but avoids it's most problematic plot changes (Zoscite and Kunzite are both Male and a couple). And does a few creative new things.
Only nitpick is I would switch the names of the character called Jadite and Nephrite, and replace the name Jay with Max.
Last one I want to comment on hear is OtaKing's TIE Fighter. He's a YouTube obsessed with 80s OVA and their shading, and wanted to animate a Star Wars project in that style.
My opinion on the video is it looks great, awesome in fact. The decision to have no dialogue is fine, doesn't suite my preferences but is a valid artistic choice. And the Sound Effects are good, they sound like right out or a Star Wars film.
But what bugs me is the Music. He uses a random song instead of the Williams Score, or something evocative of it. Maybe he wanted it to be like 80s OVA Music, but then he shouldn't make his project a Star Wars one. Much of what I love about Star Wars is it's Music. And if animators in Japan in the 80s got the chance to do a legit Star Wars project, they would have wanted to use to the Music.