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.
Satin Software - Hotel Management Software
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Bookinglayer - Bookinglayer is a combination of a PMS, activity scheduler, and a flexible online booking for businesses.
Framadate - Make your polls