I run a free template site and I would like to offer my users a website builder for free. Because we offer it free we won't be able to buy a site builder that costs per user or monthly fee, so we are looking for a one time fee script preferably written in PHP (can be asp or perl).
I know what there is one, it was a Flash type website builder and I think it was $99 one time fee for an unlimited license. I can't remember the name, sorry. But I bet that you find something on Web Hosting Talk about it if you search. Search for Flash website builder or something.
Sitezen.com is a one time fees for the basic package, they allow each user to have an advance version, and thats additional cost only if you need. Been using it and finding it very flexible and well thought concept for hosting co.