You got most of the ones I know about. Youtube is the main source at this point. And there are a few available for download here and there. Looks like you got the NASA one too.
The only other ones I know are some people who use video cards to pre-render games at 8K and capture the output.
Media: LG 88" 8K OLED Z9 / Denon AVR-X8500H 7.1.4 / Oppo UDP-203 / Nvidia SHIELD (2017) / Apple TV 4K / Sony 4K FMP-X10 / Gaming PC (Threadripper 1950X / 2x GeForce GTX 1080 Ti SLI) / PlayStation 4 Pro with PS VR / PlayStation (original)
Family: Sony 85" 4K XBR-85X900F / Denon AVR-X3400H 5.1 / Nvidia SHIELD (2017) / Apple TV 4K / C64 Mini - Game: LG 77" 4K OLED C8 / Denon AVR-X3400H 5.1 / Nvidia SHIELD (2017) / Apple TV 4K