Wikipedia
OpenNMS
OpenNMS is a free and open-source enterprise grade network monitoring and network management platform. It is developed and supported by a community of user and developers as well as by the The OpenNMS Group, offering commercial services, training and support.
The goal is for OpenNMS to be a truly distributed, scalable management application platform for all aspects of the FCAPS network management model while remaining 100% free and open source. Currently the focus is on Fault and Performance Management.
All code associated with the project is available under the Affero General Public License.
The OpenNMS Project is maintained by The Order of the Green Polo.