This is the blog of Ronald Bartels that wanders on and off the subject of problem management (that is how it started), but it is best described by Ray who says this is Daddy's thoughts! Like the best music is from the Eighties and a wee dram helps in solving most inconveniences.
Cacti - the complete RRD-based graphing tool
Cacti is a complete network graphing solution designed to harness the power of RRDTool's
data storage and graphing functionality. Cacti provides a fast poller,
advanced graph templating, multiple data acquisition methods, and user
management features out of the box. All of this is wrapped in an
intuitive, easy to use interface that makes sense for LAN-sized
installations up to complex networks with thousands of devices.
Download the tool here or checkout the more comprehensive list of tools here.