we use BigBrother, but BB has been sold and is commercial now, the new name of the free version is Hobbit (
The Hobbit Monitor )
download the package there, and use the install script, you need a compiler, rrd tool and a few other packages, I suggest using linux for the server
we use it for linux, aix, solaris, hpux, tsm, network components and so on
old bigbrother clients and ext-scripts are full compatible with hobbit