me neither, but most people that don't know much about silent payments wanted to "load" a native segwit transaction on there and re-user that utxo for a silent payment;
by default this is just a pure silent paymnet in/out wallet by the way. The rest is purely for adding functions for noobs

Since the host just went down 1 min. after posting this, here's the alternate url:
(backup url: )
https://allesvoorbitcoin.be/21tools/silent/

main url:
https://avbforge.com/silent/

if it works :)

On the right side, there's the first (and so far, only) release... if you click that, you have the code

It's a very old concept in bitcoin. But finally you have some clear and working page that allows you to actually use it, instead of "guessing" the right sequence or notation.