Share 'Do you know of a service to update a website without knowing HTML?'

Does anyone know of a free or really inexpensive service that allows users to join a website, create a template based profile page and allows them to make changes to it without knowing HTML. I have a website and am trying to simplify the registration and maintenance of the site. The page that is created by the user will need to be viewable by the public but only changed by the member. The websit…