Dudle - Dudle is an online scheduling application, which is free and open source.
PayPal Zettle - PayPal Zettle is a mobile point of sale system that allows you to accept card payments wherever you are.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
My POS Manager - My POS Manager is an online store POS system that offers eCommerce integration and full customization options.
Pulse 24/7 - Booking & scheduling mobile app for service providers
CMS POS - CMS POS is a cutting-edge point of sale solution.