TyopoytaORvelo System MOnitor -- is a system monitor that sits in the corner of your desktop. Torsmo can show various information about your system and its peripherals.
monfarm generates dynamic html pages showing the current status of a group of servers with similar configuration. Alarms are generated in case of unavailability (smtp, network).
FileTraq was designed to be run periodically from the root crontab. Each time, it compares a list of system files with the copies that it keeps. Any changes are reported in diff or patchfile style, and dated backup copies are kept.
bbwatch is a Perl- and Curses-based Big Brother monitoring tool. It features audible alerts, X background updating, acknowledgement of alerts, and direct tests and connections for broken services.
kimon is a simple ISDN monitor that attaches itself into the KDE taskbar. It displays the status of all connected ISDN devices that are known to ISDN4Linux.