FormCraft is a premium form builder that can be used to build a variety of forms including newsletter sign up forms, surveys, and application forms.
It includes conditional logic options, form analytics, and a drag and drop interface that lets you create forms in seconds. The forms are responsive and can be displayed in a number of ways including pop up, sliding up from the bottom of the page, or flying in from the side.
formcraft form builder doesn't just simply providing you with a fast and easy form builder. It also make your forms look gorgeous.
Product page: http://codecanyon.net/item/formcraft-premium-wordpress-form-builder/5335056