Hey mate great list, this will keep me busy trying to get some of these into my own collection.
I'm assuming Atari 8 bit is the XEGS (I did manuals & commercials artwork for these too if it helps)? I also notice QuadPlay isn't on there, I've done RetroFE packs for both so feel free to port them over to your collection. You might also like the custom carts and intro video I did for Pico 8
Feel free to take, share and reuse any of it, sharing is caring after all & thanks for sharing all the videos, will be getting them downloaded!
Quad play:
XEGS:
Pico 8 (custom artworks and nice intro video if you want)