The whole stuff is based on some small scripts, which I wrote myself, as ALTTPR-Multiworld from LLCoolDave (changed/extended by Bonta0). The python scripts are used by me without modification and can be found via the GitHub link and can there be looked at, downloaded and used for free.
Lets Multiworld! is hosted and paid just by me. I'd be happy, if you donate some cash but no one should be feeling forced to do so!
I am a 33 years old nerd, which has too many free time. Beside my work (software engineering) I use many of my free time for smaller projects and for a game or another. This includes ALTTPR!)
I do programming mostly in PHP and node.js.
Now and then I am live on Twitch. Feel free to follow!