Gravity Forms is a drag-and-drop WordPress form builder plugin with tons of time-saving tools & features. The plugin has various free add-ons to integrate with many different third party services such as MailChimp, HubSpot and more, as well as a huge community add-on ecosystem. It's developer-friendly with well-documented & plentiful hooks & filters, opening up a wealth of powerful possibilities. The plugin has built-in styling or the ability to turn off styling and add in fully custom CSS. If you are looking into how to add a contact form in WordPress, this plugin can help you do that and so much more!