Checkfront - Checkfront is built for Tour & Activity Operators, Rental companies and Accommodation providers. Manage your inventories online, centralize reservations, process payments and get unified access to leading distribution channels.
MakePlans - Online appointment booking - MakePlans
Mobile-Calendar - Reservation management system. If you rent accommodation, the mobile-calendar app was made for you!
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Clock PMS - Clock PMS is a cloud based software for hotels that provides online distribution, mobile hotel app, self-service and check-in kiosk, restaurant POS, rate intelligence, etc.
Dudle - Dudle is an online scheduling application, which is free and open source.