Timekit - The developer-friendly scheduling & booking solution
Dotcal - Personalized booking pages for absolutely everyone
Fig Booking Software - Your all-in-one service business management tool
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.