OwnerRez - OwnerRez is internationally recognized as a leader in the vacation rental industry for channel management, CRM, PM, accounting, messaging, and websites.
MakePlans - Online appointment booking - MakePlans
CiiRUS - CiiRUS is a cloud-based reservation and guest managmenet solution that provides features and functions to manage the reservations and guests.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Hosthub - Hosthub is a Property Management Platform that helps property owners & managers manage their properties on multiple channels.
Dudle - Dudle is an online scheduling application, which is free and open source.