Baïkal - Cal and CardDAV server
FareHarbor - Reservation software for activity and tourism businesses. Low credit card processing rates, mobile friendly. Built for you.
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Peek Pro - Peek Pro is a fastest growing appointment scheduling software specially designed for tours and activity operators to help increase their booking reaching out to large numbers of potential customers, mostly tourists.
SOGo - SOGo is groupware server with a focus on scalability and open standards.
TravelMint Software - Tetraskelion Pvt. Ltd. is an offshore business value focused IT company. It's emphasis is on software product development, mobile application development, travel desktop software and web application development