Guesty - Guesty is a cloud based software program that is designed to make owning and running an Airbnb or other vacation rental home easier.
MakePlans - Online appointment booking - MakePlans
OwnerRez - OwnerRez is internationally recognized as a leader in the vacation rental industry for channel management, CRM, PM, accounting, messaging, and websites.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Smoobu - The all-in-one vacation rental management software
Dudle - Dudle is an online scheduling application, which is free and open source.