What is an advanced form plugin for Wordpress?

Question

HTML

It is required to create a form on Wordpress like this:
www.redmapleleafmortgages.com/apply-today-for-fast...
The bottom line is that the selected item in the drop-down list affects the set of fields of the entire form.
Is there an appropriate plugin for this? Free if possible.
I did not find such a function in Contact Forms 7

Answer 1

Js+Contact Form 7