Yes, both Zoom and Calendly offer a Free Trial.
Zoom 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 Zoom Starts at $12.49/Month when Billed Yearly whereas for Calendly Starts at $8/User/Month when Billed Yearly.
Some top alternatives to Zoom includes Livestorm, Cisco Webex Meetings, Google Meet, GotoMeeting, Cisco Webex Teams, BlueJeans Virtual Meetings, VideoMeet, Jitsi Meet, Video Window and Zip Conferencing.
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.