OpenNMS – Enterprise Grade Open Source Network Management
http://www.opennms.org/

OpenNMS is the world’s first enterprise grade network management platform developed under the open source model. It consists of a community supported open-source project as well as a commercial services, training, and support organization. You should have read access to all content on this wiki, but you will need to register to add or edit pages, or upload files or images. OpenNMS is community supported, so you are welcome and encouraged to add content to this website. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.