Rezdy - Tour operators in 73 countries use Rezdy's booking software to sell thousands of products in real-time on their website and through distribution channels.
MakePlans - Online appointment booking - MakePlans
Xola - Xola is an elegant and powerful online booking and distribution system. We help tour and activity providers reduce costs, grow revenue, and save time.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
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.
Dudle - Dudle is an online scheduling application, which is free and open source.