Is there a program on Linux that allows you to monitor Hard Disk, RAM, and CPU Usage. (Would be nice to see CPU Temp as well).

We have a Linux firewall, with an AMD Duron 950 CPU, 256MB RAM. It seems to fall over when too many people access the website. It is maintained by another company and they don't know whats going on.

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For I dipt into the future, far as human eye could see,
Saw the Vision of the world, and all the wonder that would be; -ALFRED LORD TENNYSON (1809-1883)