Yes, both Stripe Billing and Calendly offer a Free Trial.
Stripe Billing is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Calendly is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Calendly begins at $8/User/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 Calendly includes Appointy, Acuity Scheduling, Setmore, Microsoft Bookings, Cogsworth, Book Like A Boss, Doodle, Tidycal, Cal.com, DaySchedule, Google Calendar, Calendar and Zoho Booking.