monitor(3) - phpMan

cpupower-monitor (1) - Report processor frequency and idle statistics
dbus-monitor (1)     - debug probe to print message bus messages
devlink-monitor (8)  - state monitoring
dmfilemapd (8)       - device-mapper filemap monitoring daemon
fanotify (7)         - monitoring filesystem events
git-fsmonitor--daemon (1) - A Built-in Filesystem Monitor
inotify (7)          - monitoring filesystem events
iotop (8)            - simple top-like I/O monitor
ip-monitor (8)       - state monitoring
ip-netconf (8)       - network configuration monitoring
mdmon (8)            - monitor MD external metadata arrays
mii-diag (8)         - Network adapter control and monitoring
perf_event_open (2)  - set up performance monitoring
perfmonctl (2)       - interface to IA-64 performance monitoring unit
rtmon (8)            - listens to and monitors RTnetlink
sa-check_spamd (1)   - spamd monitoring script for use with Nagios, etc.
sw-collectdmon (1)   - Monitoring daemon for collectd
xgamma (1)           - Alter a monitor's gamma correction through the X server
xtables-monitor (8)  - show changes to rule set and trace-events