Yes, both Stripe Billing and Formplus offer a Free Trial.
Stripe Billing is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Formplus is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Formplus begins at $20/Month when Billed Yearly, while pricing details for Stripe Billing are unavailable.
Some top alternatives to Stripe Billing includes Stripe Payments, Invoiced, Chargebee, Square Invoices, Servicebot, BillingPlatform, Billbooks, ChimpCharge, Billin and Stripe Invoicing.
Some top alternatives to Formplus includes Cognito Forms, Formsite, Typeform, Google Forms, Jotform, 123FormBuilder, Microsoft Forms, Framestr Online Forms, Forms, Forms.io by 500apps, FormLink and GoZen Forms.