Qloapps - Open Source System - Build Hotel Booking Website and Manage Online & On-Desk Bookings.
Reminduck - A simple reminder app made for elementaryOS with Vala and GTK. - matfantinel/reminduck
FewohBee - Web based management tool for hotels, pensions, accommodations and vacation homes
Memo to Me - Online email & SMS reminder service.
BSI Hotel Booking System - BSI Hotel Booking System is a real time online hotel booking.
Simply Remind Me - Free email and text reminder service so you don't forget the important things in life!