Yes, both Full Slate and Calendly offer a Free Trial.
Full Slate 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 Full Slate Starts at $29.95/Month whereas for Calendly Starts at $8/User/Month when Billed Yearly.
Some top alternatives to Full Slate includes Appointy, Calendly, Cogsworth, OpusTime, Book Like A Boss, Scheduly, Bookerlooker, ClickBook, DaySchedule, FlexBooker, Web-appointments, CalendarSpots.com and CatchApp Bookings.
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.