HotelBuster
(unofficial)
This is a version of Hotel with the great idea to be played through Network or Internet.
The whole game runs with Java, so to be compatible with different Operating Systems.
I think it is not a "user friendly" game, you have to play with the configurations for a while to understand how a server works.
The hotels design were ripped from the game "Simcity 2000", and for this reason it seems that the programmers had copyright issues, so the project has been stopped.