High Quality Content by WIKIPEDIA articles! Opsview is an open source network, server and application monitoring tool. It is released under the GNU General Public License (GPL) version 2. Opsview uses Nagios Core as its monitoring `engine` and incorporates Nagvis, NagiosGraph, MRTG, NMIS into a single tool. Opsview provides a web user interface that allows system administrators to access monitoring views and configure monitoring settings. Opsview 3.0 was released in February 2009