Good free monitoring software?

[Red Squirrel]

What do you think is better?

I know of Pandora, Zenoss, and there's a few others I forget. I'm semi familiar with Pandora as we use it at work (I don't administrate it though so I only know the front end). I'm leaning towards using Pandora for my home/internet servers, but wondering if the other solutions are better.

I have an old box sitting doing nothing, think I'll turn it into a Pandora monitoring box.

 

[RiDDLeRThC]

We use Splunk at work. Just starting to dive into it and learn more about it but from what I can tell it can monitor just about anything.

 

[Dytralis]

Nagios

 

[mjwired]

Nagios is amazing. You can have Nagios do anything you could imagine. You can make simple scripts to monitor ANYTHING. There is also a fairly large community behind it, so you get great things like iPhone apps and samples and plugins, etc. I use Nagios to monitor latency,uptime, network, hard disk, cpu, ram utilization, etc. I also use it to check SQL databases, web apps, and server dameons.

Another great open source tool is Cacti. Cacti is a RRD tool that gives you a beautiful web interface for viewing graphs, adding hosts, making templates, etc.

I have some Nagios/ Cacti information on my blog at http://blog.mjwired.com