Sendinblue
Sendinblue is an email marketing tool with which you can create marketing automation and email campaigns for your business. You can easily increase your sales thanks to the automatic e-mails you will send to your users and the abandoned cart reminder feature.
Thanks to the integration of forms.app and Sendinblue via Zapier, you can create subscriber registration by adding user data and sending an e-mail from your Sendinblue account.
You might also like

Feedly
Subscribe to a resource and start following the content you're interested in.Zapier

Leadfox
Create a lead and add it to the contact list.Zapier

Helpspot
Create tickets, users, and have a much more automated customer support process with these Helpspot integrations.Zapier

Troops
Create a company profile and automate employee management.Zapier