The list of open source SNMP tools
http://www.openxtra.co.uk/network-management/monitor/open-source/
and the one which skipped this list
http://www.itmanagement.com/features/10-open-source-network-tools-052407/
http://collectl.sourceforge.net/index.html
NetXMS
Mon
OpenNMS
and the mecca list of all
http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html
