DrmStats

DrmStats is a collection of shell scripts that uses RRDTool to monitor (i.e. make graphs) your system's health. A cron job updates the RRD database and generates PNG graphs of network bandwidth, memory state, ADSL synchro (for Sagem F@st 800 users), number of processes, disk usage, CPU load, and more. It's easy to understand and can be customized for your needs.