gisdnload is an ISDN load meter for Linux running as a Gnome applet. The display supports autoranging and changes its background color depending on whether you are online or offline.
sysfence is a resource monitoring tool designed for Linux machines. While running as daemon it checks resource levels and makes desired action if some values exceed safety limits.
RFC is a set of scripts that aims to help system-Administrators run a filesystem-checker (like tripwire, aide and so on...) from a "master-node" to several "slave-nodes" using ssh, scp, sudo and few other common shell commands.
LogScanner reads messages from syslog or any other logging program via a pipe, analyzes the messages with the PCRE library, and sends email to the administrator about any errors or violations.