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.

Framadate - Make your polls

Satin Software - Hotel Management Software

Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.

Bookinglayer - Bookinglayer is a combination of a PMS, activity scheduler, and a flexible online booking system for businesses.

Dudle - Dudle is an online scheduling application, which is free and open source.