Gravity Forms

Gravity Forms is another staple in my WordPress toolbox.  A plugin you will find on almost every WordPress install I develop.  Gravity Forms is a feature rich form builder.  Not only for contact forms, it can integrate with payment processors such as Stripe & PayPal, it can integrate newsletter sign-ups with MailChimp, and much more.

While it is a premium plugin, they provide great support and frequent updates to ensure the plugin remains compatible with WordPress and updated with any security vulnerabilities.