entr - Run arbitrary commands when files change
incron - This program is an "inotify cron" system. It consists of a daemon and a table manipulator.
Anacron - Anacron is a periodic command scheduler. It executes commands at intervals specified in days.
fcron - Fcron is a scheduler designed for Unix/Linux systems, especially usefull when your system is not up all the day long.
BSI Hotel Booking System - BSI Hotel Booking System is a real time online hotel booking.
Guard (CLI Tool) - Guard is a command line tool to easily handle events on file system modifications.