Qloapps - Open Source System - Build Hotel Booking Website and Manage Online & On-Desk Bookings.

incron - This program is an "inotify cron" system. It consists of a daemon and a table manipulator.

HotelDruid - Hoteldruid (ex Php-Residence) is an open source program for hotel management developed by...

fcron - Fcron is a scheduler designed for Unix/Linux systems, especially usefull when your system is not up all the day long.

OrgBusiness Software - Organize, track, manage any information related to your home, business or organization.

Anacron - Anacron is a periodic command scheduler. It executes commands at intervals specified in days.