documentation: https://zen.etegan.eu/documentation/zen-booking

Free version of ZenBooking module (there exist several modules in joomla for this type of activity
This one has a free component that at least enables playing with it

• Solo Professionals: Consultants, lawyers, therapists, personal trainers, or independent mechanics.

• Organizations & Teams: Beauty salons, clinics, workshops, or multi-employee support centers.

Free vs. PRO

• The FREE version provides a rock-solid foundation: an elegant public calendar, basic service management, smart data auto-fill for logged-in users, and a clean backend administration panel.

• The PRO version transforms the component into a complete command center. It unlocks the Hybrid Architecture (seamlessly switching between Solo and Multi-Staff modes) and introduces the Frontend Staff Dashboard, empowering your team to manage ad-hoc walk-ins, reschedules, or schedule delays directly from their phone or tablet, without ever touching the Joomla backend.