network monitoring tool

I am looking for someone to recommend an free networking software to monitor windows service (restart a stopped service), send alert if service/device is offline. Have some kind of netflow, to tell top talkers or who is causing the problem on the network. I have used MRTG but it is limited.

thanks in advance
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pablito70Connect With a Mentor Commented:
I think what you are looking for is Nagios; if your devices are part of snmp community, you can use it for monitoring, virtually, everything.

The website is simply

AkinsdConnect With a Mentor Network AdministratorCommented:
PTRG - Free only for up to 10 devices

OPManager - Free only for up to 10 devices

or the dude

Nagios unfortunately is not free
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Emmanuel AdebayoConnect With a Mentor Global Windows Infrastructure Engineer - ConsultantCommented:
pablito70Connect With a Mentor Commented:
There is a free download for Nagios, in addition to commercial release:
masnrockConnect With a Mentor Commented:
Zenoss is another one that can be worked with... is the site for their free Core edition.
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