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Zenoss Core features complete network, server and application monitoring within a single product. Zenoss Core provides IT professionals the ability to monitor any SNMP enabled device. Deep metric collection is via syslog, SSH for Unix and WMI for Windows...
Opsview is an enterprise grade network, server and application monitoring tool. Features include Nagios compatibility, distributed monitoring, flexible status views, data warehouse and reporting. Linux and Solaris packages at http://downloads.opsview.org
GroundWork Monitor Community Edition provides an essential IT monitoring solution that enables you to maintain network visibility and control. This is a single server deployment that leverages the strengths of 15 other open source projects.
Nagios is a powerful enterprise class host service application and network monitoring program Designed to be fast flexible and rock solid stable Nagios runs on NIX hosts and can monitor Windows Linux Unix BSD Netware and network devices
Multi Router Traffic Grapher (MRTG) uses SNMP to query your network device for the amount of traffic they have passed through each of their interfaces since the last query. MRTG generates webpages and graphs for each interface it queries.
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