OpenNMS is the world's first enterprise grade network management application platform developed under the open source model.
Well, what does that mean?
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World's First
The OpenNMS Project was started in July of 1999 and registered on SourceForge in March of 2000. It has years of experience on the alternatives.
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Enterprise Grade
It was designed from "day one" to monitor tens of thousands to ultimately unlimited devices with a single instance. It brings the power, scalability and flexibility that enterprises and carriers demand.
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Application Platform
While OpenNMS is useful "out of the box," it is designed to be highly customizable to create an unique and integrated management solution.
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Open Source
OpenNMS is 100% Free and Open Source software, with no license fees, software subscriptions or special "enterprise" versions.
For details on installing OpenNMS, please see the install guide: Installing OpenNMS.
For details on building OpenNMS, please see the wiki page: Building OpenNMS.