We use Wufoo as a DIY form builder for our marketing department so that we can incorporate forms in our websites without a huge technology lift. We use this tool to build simple contact forms for our website all the way to more complex 'applications' for our business where users can submit more detailed information and even attach documents.
Wufoo has a super simple drag and drop form building interface which doesn't require any technical knowledge to create and publish a form.
Wufoo also provides easy to use options for creating dynamic questions and allows for customizable field, page, and form logic/rules.
We really like how easy it is to create and manage email notifications. These notifications are easy to change if internal staff shifts and notifications can also be tied to specific fields and user responses to help get the form submissions to right people as efficiently as possible.
Wufoo is a great tool for building forms. It is especially handy for marketing and non-technical users so that you can develop and implement forms and reduce the need for technology support. We've used this tool for 5+ years and have taken on the form-creation duties for our websites and we've never looked back. With that being said, if you are looking to create a very complex form with a lot of fields and lots of field/page logic, Wufoo may not be the best tool for you and/or you may need significantly more technology support.