Formidable Form Builder is an advanced plugin for WordPress by Strategy11. There is a free version and different premium paid for versions, with many additional features.
Differences between free and Pro versions at:
https://formidableforms.com/knowledgebase/what-is-the-difference-between-the-lite-free-and-pro-version/
Formidable is 100% mobile responsive. Your WordPress forms will always look great on all devices (desktop, laptop, tablets, and smartphones).
More info and download: https://en-gb.wordpress.org/plugins/formidable/
