magusor

It was rather widely used around here in Europe as a "key" to enter building hallways. They've been mostly replaced with NFC fobs nowadays (most of them using very vulnerable chips though).

I think op meant the custom songs, there are thousands of them, amoung which a lot are of very high quality gameplay wise. I've been playing beat saber since when it came out (so about 7 years I'd say), and while I do play an "official" song here and there, most of my playtime is on customs. While this custom content does play in their favor, they do not however make it trivial to access it (you have to mod your game, which is a bit involved on a quest headset), unlike some other games, so I guess a lot of buyers don't actually buy the game for the custom content

Yes, they are indeed not as streamlined unfortunately. Maybe ethercalc if you need something lightweight, but that's also not a real alternative https://ethercalc.net/

Have you tried collabora office and/or onlyoffice ? These could match your need.

The folks at ALVR (another vr streaming client/server) are doing something similar, but are open source : https://github.com/alvr-org/alvr

They also achieve very low latency, I didn't follow every single optimization they added but it basically boils down to a few encoding tricks (better image in the center, accept blurriness in the peripheral vision), good network infrastructure, and hardware decoding / encoding being really fast.