Trustpilot
Trustpilot is a review management platform developed for online businesses to gain user trust and communicate with them. It was developed to improve conversions, stand out and increase your sales.
You can create an invitation by combining your forms.app and Trustpilot accounts. Doing so will provide a shortcut for your users to rate you.
You might also like

Zoho CRM
Create new deals, tasks, activities, and automatize your sales processes.Zapier

CallHippo
Reach users around the world and create the perfect profiles.Zapier

Podio
Organize your workflow according to your project needs.Zapier

SmartEmailing
Streamline new contacts to your emailing list from your form responses and automate your work.Zapier