Observium is an autodiscovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems including Cisco, Linux, FreeBSD, Juniper, Brocade, Foundry, HP and many more.

Observium has grown out of a lack of easy to configure network monitoring platforms. It is intended to provide a more navigable interface to the health and performance of your network. Its design goals include collecting as much historical data about devices as possible, being completely autodiscovered with little or no manual intervention, and having a very intuitive interface.

Observium is not intended to replace an up/down alerting system, but rather to complement it with an easy to manage, intuitive representation of historical and current performance statistics, configuration visualisation and syslog capture.

Free, Libre, Gratis - Observium is Free Software. This means that you can use and redistribute the software without permission and without paying anything.
Observium supports monitoring of the following metrics: CPU, Memory and Storage statistics. Interface traffic, packet and detailed error statistics. BGP and OSPF statistics. MPLS VPN configuration. Temperature, Fan Speed, Voltage, Amperage, Power, Humidity and Frequency sensors. Detailed IPv4, IPv6, TCP and UDP stack statistics. Users, Processes, Load Average and Uptime statistics. Linux distribution detection. Cisco CEF statistics. Cisco IPSec VPN statistics. Juniper ATM VC statistics. Real-time interface traffic graphing. Device inventory collection. CDP, FDP, EDP, LLDP tracking. PAgP tracking. Interface stack tracking.