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apache-top

apache-top is used to parse the server-status/ apache page (usage: apache-top.py http://servername/server-status)

Note: Not to be confused with apachetop, which use apache's log files instead.

iftop

iftop monitors network usage.

mtop

MySQL real-time monitoring. access MySQL using the “mysqltop” user with no password by default, so create on the MySQL server.

iotop

iotop monitors, well, i/o.

Debian-admin article