Herschell Gordon Lewis is best known for being a legend of gory schlock horror, but his resume also included two children's films. Of the two, the 'best worst' is the earlier by one year: Jimmy the Boy Wonder, featuring a low-budget Land-of-Oz-with-the-numbers-filed-off, a bizarre villain named Mr. Fig and a lengthy sequence of poorly-dubbed possibly-European animation. The other, The Magic Land of Mother Goose (aka Santa Visits the Magic Land of Mother Goose - guess who never appears in the film?), was the result of Lewis being hired to shoot a vehicle for a magician entirely on a high school stage. Both films are available for purchase from Something Weird Video (parts of site NSFW) as downloads and DVD-Rs.
There exists a trilogy of complete Portguese live-action Pokemon fanfilms. That is all. (Subtitles available, and not the automatically generated kind; click the Subtitles/CC button on the video's lower right.) Playlist links: The Mysterious Virus. Destiny of a Hero. The Light of Hope Part 1, Part 2. (MLYT) [more inside]
Kichwateli (Kenya, 2011; 07:46), The Day They Came (Nigeria, 2013; 03:59), The Tale of How (South Africa, 2006; 04:28; previously), Alive in Joburg (South Africa, 2006; 06:22; previously), Umkhungo (South Africa, 2010; 30:34; trailer alt. link), Evolve (Egypt, 2014; 24:17), Mwansa the Great (Zambia, 2011; 23:11; two trailers as alt. links), and Pumzi (Kenya, 2009; 21:51): eight short works of SF/fantasy via The Skiffy and Fanty Show.
A Trailer for Every Academy Award Winning Movie Ever (single link cracked.com video)
A site for artist Bas Jan Ader (wikipedia) who was last seen in 1975 when he took off in what would have been the smallest sailboat ever to cross the Atlantic. Site includes his most famous piece, I'm Too Sad to Tell You.
Reversible flow! In the 1960s, the National Committee for Fluid Mechanics Films produced a series of films for education in fluid mechanics. This clip is part of "Low Reynolds Number Flow"; you can find the entire collection streamed here. Interesting demonstrations abound. (1st link is QT; rest are RealPlayer.)
Mediocre Films consists of films which are... mediocre, hence the name. Night of the Zombie. Batty Bat-Bat. Gorgeous Tiny Chicken Machine Show. Granted, it's not LG15 but I think that's what I like about it most. These short subject films are made by some guy named Greg, with help from other people whom you may have never heard of before. Occasionally they also feature a guy named Adam whom you might recognize but you may not be able to recall from where. It's funny. Well. I liked it. My girlfriend didn't. She said they were mediocre; to which I said, "exactly!" Sheesh. Women.
Big Screen Version [.mov, 9.5MB - 3 min.] is the title of a short film described as "Split-screen talking heads and flying graphics collide in a musical homage to the self-righteous rhetoric of Fox News." made by film and videographer Aaron Valdez. Other gems of his include Politics, Any Way You Slice It, and his regularly updated vlog.
Windsor McKay (of "Little Nemo in Slumberland" fame) and George Herriman (of "Krazy Kat" and "Archie & Mehitabel") weren't just innovative, influential cartoonists; they were also pioneering animators. The Library of Congress' Origins of American Animation project has downloadable short films by McKay (including his celebrated Gertie the Dinosaur) and Herriman as well as others from the early, early days of animated film.