This blog forms part of the http://performanceGuru.com website which focuses on performance tuning UNIX-like Operating Systems (including Linux).
to the tools page of my website:performanceguru.com
The description I gave it went as follows:
"Cacti provides a PHP front-end to the rrdtool plotting package. This package also runs on Solaris but I have listed it under Linux as all of the dependencies are already satisfied in Linux (although this will probably even out with the advent of OpenSolaris). In functionality terms Cacti is very similar Orca except it is not limited to the SE Toolkit as a data source. It can be viewed as a template driven data graphing system."