SnapCalendar.io's answer:
A clean, intuitive interface that simplifies scheduling and management tasks.
Photo Calendar Creator - Photo Calendar Creator is a convenient program for making calendars for any year or month.
Appointment Reminder - Automated SMS/Voice and Email Reminders.
Photo Calendar Studio - Photo Calendar Studio is a program to design and print calendars with your own photos.
Reservio - Reservio is a simple online booking and appointment scheduling application.
CalPrint - CalPrint uses your existing reminders and calendar entries on your iPad or iPhone (Exchange, iCal and Google Calendars etc.
Square Appointments - Add an online booking link. Easily embed the customizable widget directly on your website. Any changes to your online scheduling, prices, or services update automatically.