Link:
Webform.com is a form and survey service built on the Open-Source software Drupal and Webform. Drupal has existed since 2001 and the Webform module for it has existed since 2004. During this time, the functionality of Webform has been exclusive to those able to set up a website, or able to pay someone to do it for them. Webform.com is intended to expand the audience that can build simple forms and surveys without needing to set up their own web site. It also demonstrates the full abilities of the Webform module for sites that are evaluating using Webform for their own site.
Because the software packages used to build Webform.com are free and open-source, you can easily replicate the functionality of Webform.com on your own servers.