We do not require sign-up to use our form builder web app. You can access all of the pages without login. You can create a form, copy it to your web site and get submissions by email. (The email address can be entered on the form setup.)

This gives people a chance to try the product without making a time investment. We are getting close to 1 million users (not including guest users) so it seems to be working pretty well for us.

Our product is JotForm if you would like to see how it works. www.jotform.com