Dudle - Dudle is an online scheduling application, which is free and open source.
StayNTouch - StayNTouch provides a full-featured mobile PMS and guest engagement capabilities.
Pulse 24/7 - Booking & scheduling mobile app for service providers
Agilysys Stay - Property management software for the hospitality industry
MakePlans - Online appointment booking - MakePlans
SkyTouch Hotel OS - Hospitality property management