Opsview Community Edition 3.8 is free, open source enterprise network and application monitoring software that is available as a virtual appliance for VMware player. However, it can be converted to run on VMware ESX or ESXi by using the free VMware vCenter Converter tool.
Opsview is built on Nagios, an open source enterprise management platform. Opsview adds enhancements to notifications and alerting (both in terms of controls and methods), support for SNMPv3 with MRTG, flap detection, faster importing and improved uptime checks. In addition to the VMware appliance, Opsview Community Edition can be downloaded as source or binaries for RHEL 5, CentOS 5, Debian, Ubuntu and Solaris 10.
Normally, an advanced management tool like Opsview would be difficult to install and configure, however most of the pain of installation is eliminated with the virtual appliance version of the product, where initial setup takes only a matter of minutes.
The browser-based GUI is informative and easy to navigate, making it a snap to add devices to be monitored and to define dashboards that offer meaningful information. The Community edition is offered under a GPL licence, while a more advanced version of the product that includes support is offered under a subscription model. Managers of smaller, simpler networks may find everything in the free version to meet their needs.
Opsview offers some unique features that make it a formidable management tool, such as support for monitoring virtual servers and a variety of hardware components found throughout the network.