GKrellM

GNU Krell Monitors (GKrellM) is a system monitor software 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, e.g., controlling the XMMS media player or a SETI@home client from within the stacked monitor.

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