Question : Windows, Linux and network real time monitoring tools.

We have several Linux and Windows servers. I would to know if there is any software or hardware (preferably free Linux software) for monitoring in real time all of our servers (for usage, network connectivity, disk space, etc) and the network.
Ideally I would like to be able to create a linux monitoring server with all the info from all the other servers displayed on a large monitor. This would give me an overall view of the network and systems on one big screen. Nice graphics would be a plus.
As an example, I already do this on my OS x at home with geektool and some home made scripts, to monitor my home Linux servers.

Answer : Windows, Linux and network real time monitoring tools.

Have a look at http://www.nagios.org/