Gravity Forms is an easy-to-use form management plugin for WordPress. Using the add-on, you can build solid, customizable forms for your WordPress site, add subscribers to a mailing list using conditional logic and populate custom fields. Even better, it’s free to download if you hold a Business or Developer license for the Gravity Forms plugin.
Additional features include advanced field types, form scheduling and WordPress post creation tools. Gravity Forms also comes with an extensive API with hooks and filters to allow developers to extend the functionality and customize the plugin. Take a look at the Gravity Forms’ feature tour and demo site, or read more about the Campaign Monitor add-on for WordPress.