• Nagios 21.9%

• Wireshark 20%

• htop 17.4%

• Other 7.7%*

• Zabbix 7.1%

• Zenoss 5.1%

• PC Monitor 4.8%

• Munin 3.4%

• New Relic 2.9%

• SaltStack 2.7%

• Monit 1.9%

• NTM (Network Traffic Monitor) 1.8%

• FlowViewer .8%

• Opsview .8%

• Manage Engine .6%

• SysPeek .6%

• Circonus .4%

• xosview .3%

*Popular write-in: Icinga.