Reminder Commander - Reminder manager that reminds you about important events in advance.
Qloapps - Open Source System - Build Hotel Booking Website and Manage Online & On-Desk Bookings.
Holiline Reminder - Holiline Reminder is both an event reminder and a calendar.
FewohBee - Web based management tool for hotels, pensions, accommodations and vacation homes
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
BSI Hotel Booking System - BSI Hotel Booking System is a real time online hotel booking.