https://www.gravityforms.com/add-ons/help-scout/

Automatically add subscribers to your email lists when a form is submitted.Automatically assign a ticket to a specific mailbox in Help Scout.Automatically assign a ticket to a specific user in Help Scout.Define and customize the content used to create the ticket using merge tags.Create tickets conditionally based on user interaction with your form.

https://www.gravityforms.com/add-ons/mailchimp/

Directly integrate your forms with MailChimp to gain more mailing list subscribers. With Gravity Forms and the MailChimp add-on, every form on your WordPress site becomes a potential subscriber! Packed with features and incredibly easy to use, we know you'll fall in love with Gravity Forms just like millions of companies worldwide have.

https://gravitywiz.com/documentation/gravity-forms-pay-per-word/

Create products which calculate a total based on the number of words in a Paragraph of Post Body field.

https://gravitywiz.com/documentation/gravity-forms-date-time-calculator/

Use Date and Time fields in your Gravity Forms calculation formulas to calculate the time between different dates and times.