Campaign Monitor
Campaign Monitor is an email marketing solution where you can send personalized emails that facilitate communication with your subscribers. With Campaign Monitor, you can increase user engagement and create loyal users.
By integrating forms.app and Campaign Monitor, you can create a new subscriber profile in your list and update or unsubscribe. Thanks to this integration, it is also possible to send smart transaction e-mails to your subscribers.
You might also like

DeskTime
Strengthen your time management and project monitoring.Zapier

MonkeyLearn
Use your form and survey responses as data sources and report them.Zapier

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

Callingly
Create lead profiles with your form data.Zapier