====== top ======
the classic [[http://sourceforge.net/projects/unixtop/|top]] util, used for real-time process list
====== htop ======
[[http://htop.sourceforge.net/|top on steroids]]: color display, bar-graph per-CPU usage 

====== apache-top ======
[[http://www.fr3nd.net/projects/apache-top/|apache-top]] is used to parse the server-status/ apache page (usage: apache-top.py http://servername/server-status, so the server needs - obviously - mod_status)

Note: Not to be confused with [[http://freshmeat.net/projects/apachetop/|apachetop]], which use apache's log files instead.

====== iftop ======
[[http://www.ex-parrot.com/pdw/iftop/|iftop]] monitors network usage.

====== mtop ======
[[http://mtop.sourceforge.net/|MySQL real-time monitoring]]. access MySQL using the "mysqltop" user with no password by default, so create on the MySQL server.

====== iotop ======
[[http://guichaz.free.fr/iotop/|iotop]] monitors, well, i/o.

[[http://www.debianadmin.com/iotop-simple-top-like-io-monitor.html|Debian-admin article]]

====== pftop ======
[[http://www.eee.metu.edu.tr/~canacar/pftop/|pftop]] is a simple monitoring tool for pf, the [[http://www.openbsd.org/faq/faq6.html#PF|packet filter]] for [[http://www.openbsd.org/|OpenBSD]].

====== gotop ======
[[https://github.com/cjbassi/gotop|gotop]] top utility with beautiful text-graphs, written in go.

====== ctop ======
[[https://ctop.sh/|ctop]] monitors containers.

====== powertop ======
[[https://01.org/powertop/|Powertop]] is a Linux tool to diagnose issues with power consumption and power management.