MacAT is a "cron" task scheduling application for Macintosh server administrators. It is a PowerPC application that allows 37 of the most common MacOS tasks to be run daily, weekly, fortnightly, monthly or yearly without user intervention.
These scheduled tasks include:
Launching Applications, Files and AppleScripts; Quitting individual applications or alternatively quitting all currently running processes; Rename and Delete any File or Folder; Hide and Show applications, Mount remote AppleShare volumes; Copy Files or Folders to mounted AppleShare volumes; Unmount nominated AppleShare volumes; Restart or shutdown the Macintosh, eject Zip disks and send eMail.
MacAT is available for US$49. You can find more information at the MacSOS Web site.