Are you looking for a person, or a PHP script to install/update scripts?

Jay

Do you mean like: a local desktop application that contains the PHP sources, reads the FTP user/pass+MySQL user/pass/db and does all the copying, unzipping, setting up, so as to just open the page and heve it working?

Or a server-side script that could take care of this. In this case, it's OS independent by default... since PHP is quite platform independent.