I’m building an cms, it's almost completed, but I struggle with a difficult question. The customer wants the ability to edit and create there own forms. Now I’m looking for a nice solution to make this work but I haven’t any idea where to begin. Hope anyone can help me.

its not free but you can do it with this:

www.cutesoft.net/ASP/

Advanced Form Handling, www.hkprog.com/afh provides both forms creation and mailing.

Free forms creation on the site or purchase to run on your own PC or server.

A complete forms solution for both experienced web masters and novices. Forms Creator, Forms Processing and mailing and extensive database facilities. Can create forms for copy and paste or use directly from the database. Can be used with no database. All automatic processing or fully customizable emails and form reviews. Forms results can be exported, viewed, edited or bulk mailed.

What do you think about creation online forms with database backend, using free online object oriented database www.mytaskhelper.com ?