SoundPacks that are obtained from Multiplayer Piano (and clones), and ported to SF2.
The SoundFonts are split into 3 branches; Quality, Lite, and SuperLite, so you can decide which variant is right for you.
Although Google Drive doesn’t show descriptions most of the time, I’ll explain these branches here:

Quality: Uses all samples from the SoundPack. No alterations were made aside silence removal at the beginning.

Lite: Uses reduced samples to lower file size. Again, no alterations were made to the samples.

Super Lite: Uses reduced samples just like regular lite, but splits the samples in half to make use of Looping.

See the main folder to view everything.
(Note: The Experimentals folder is not a branch, but rather extras.)

All known site files from multiplayer piano can be found here.

One previously unknown site file has been found:
https://multiplayerpiano.com/.well-known/update.old

This file contains the following information:

{"id":1,"chat":{"a":"You should refresh now.", "p": {"_id":"", "name":"mpp", "color":"#ffffff", "id":""}},"refresh":false}