Krell Monitors (GKrellM) is a computer program based on the GTK+ toolkit that
creates a single process stack of system monitors. It can be used to monitor
the status of CPUs, main memory, hard disks, network interfaces, local and
remote mailboxes, and many other things. Plugins are available for a multitude
of tasks, for example, controlling the XMMS media player or a SETI@home client
from within the stacked monitor. GKrellM is popular among users of Linux and
other Unix-like operating systems.