OpenNMS is an enterprise-grade network monitoring platform developed under the open source software model. It consists of a community-supported, open-source project as well as an organization offering commercial services, training and support.
OpenNMS an introduction
SNMP and OpenNMS
Hyperic-HQ Integration With OpenNMS
Funds the OpenNMS application development
Order of The Green Polo
is the core community maintainers of OpenNMS
OpenNMS @ Sourceforge