SOGo - SOGo is groupware server with a focus on scalability and open standards.
VisaHQ - Passports and Travel Visas Online: Comprehensive Information on Passport Services, Visa Requirements and Applications. Real-time Status Updates, Live Help.
Baïkal - Cal and CardDAV server
Travrek CRM - Other Travel Arrangement
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
CruiseBase - Other Travel Arrangement