Yet another popular form builder for WordPress, with more than 300.000 installations at the time of writing. Formidable Forms features a Gutenberg form that gives a good impression on how the form will look on the frontend.
Demo form
Extract from WordPress.org
We built Formidable Forms to offer the “first-ever” solutions-focused WordPress form plugin on the market. You can use our drag & drop WordPress form builder plugin to create a contact form, survey, quiz, registration form, payment form, purchase, email marketing, or calculator form. Build just about anything you can imagine.
https://wordpress.org/plugins/formidable/