Yes, both FlexBooker and Calendly offer a Free Trial.
FlexBooker is designed for Large Enterprises, Medium Business and Small Business.
Calendly is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for FlexBooker Starts at $39/Month when Billed Yearly whereas for Calendly Starts at $8/User/Month when Billed Yearly.
Some top alternatives to FlexBooker includes Appointy, Calendly, Cogsworth, OpusTime, Book Like A Boss, Scheduly, ClickBook, GoSchedule, Booking Social, Odoo Appointments, Web-appointments, CatchApp Bookings and Zoho Booking.
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.