The Home Movies of Harry Teickichi Kawanishi (Videos, Harry Teickichi Kawanishi, 1940-1968)

From the University of Washington's Moving Image Archive. You can watch them here.

Miscellaneous Japanese TV Recordings (unknown years)

You can watch them here. (The videos that seem to have the same preview image are in fact different - the images are slightly different.)

Jiji and the Mysterious Forest Chapters 1 and 2 (Windows, JIJI, 1994)

Absolutely adorable Japanese Windows 3.1 RPGs. You can play them in your browser here.

Tip: if the music sounds warbly, try a different browser.

The Birth of Japan/The Three Treasures (Video, 1959)

Toho's epic three-hour-long 1000th film, the longest kaiju film ever made. This is a subtitled version of the orginal three-hour-long cut, rather than the 112-minut subtitled version from 1960. You can watch it here.

Dr. Hell’s Conquest of the World (Windows 3.1, Toshiyuki Nishihara, 1994)

You can play it in your browser here.

Kure Kure Takora (Videos, 1973-1974)

The Toho-made, Devo-inspiring (and from there, Yo Gabba Gabba-inspiring) kids show whose name translates very satisfyingly to Gimme Gimme Octopus. You can watch it here.

Spectreman: The Complete Series (Videos, 1971-1972)

The complete English dub of the ecologically aware Japanese tokusatsu series. Watch it here, or watch it unofficially edited into eight movies here.

The fanart below is from here.