Monitoring Tools for Windows and non-Windows machines

[Guest Hassan]

Are there any good open source( cheap ;) ) monitoring tools for Windows and

non-Windows machines that can monitor perfmon counters, event logs,custom

queries, ping failures,etc.. and alert on thresholds that are defined.

 

The enterprise level tools like Quest and i3 are a bit too expensive and was

looking for some open source tools if any or something affordable.

 

MOM will also not work bcos I want to also monitor some Linux machines that

we have.

 

Can someone recommend a tool to monitor our 15 servers we have today ?

 

Thanks

 

P.S. Hows OpManager from AdventNet ? What about Nagios ?

 

Just heard the above names