A free program for Android, by Appointment-Plus.
Appointment-Plus is a versatile scheduling tool that can help you manage your business appointments, no matter where you are. You can create, manage and update them in real-time, on the go. You can also invite staff, set their availability and manage their appointments from the same app.
The Appointment-Plus app also lets you create reminders for your clients and staff, so you'll never forget a deadline or an appointment again.
To create an appointment, simply choose a service type and a client or staff member. You can then choose a date and time, and you're done. To invite staff or clients, you can simply enter their information and select their availability.