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.

Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.

Satin Software - Hotel Management Software

Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.

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

SavvyCal - A scheduling tool both the sender and the recipient will love.