SegMetrics
SegMetrics is the CRM solution for finding new leads and optimizing the entire customer lifecycle. It's perfect for detecting where your potential customers come from and their usage habits.
When you integrate your forms.app and SegMetrics accounts, you can create a contact or subscriber profile and add an invoice or purchase to the contact.
You might also like

Files.com
Export your form responses to Files.com and easily share them with team members.Zapier

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

Basecamp
Automate your project management processes with this Basecamp integration.Zapier

Discord
Share your form responses with your colleagues on Discord.NativeZapier