I'm looking for a way to monitor/audit our network. I'd like to monitor our Windows and Linux servers, switches, router, etc. I'd also like to monitor disk usage, traffic flow, equiptment failures, and so on. I would love to get text messages and/or email on critical events. And the clincher...I'd like to find a F/OSS solution.
I'm currently looking at the following:
Network Administration Visualized: http://sourceforge.net/projects/nav/