Decent Open Source Service Monitor app

[Mark Haney]

I'm looking for a good open source service monitor.  I just need something 
that will monitor specific services or ports and can send an email if the 
service fails.  I don't mind using Big Brother or something like that, but 
it's really overkill on our network.  Can someone point me in a good 
direction that can handle Linux and Windows boxes?

-- 
Estne volumen in toga, an solum tibi libet me videre?

Mark Haney
Development, Systems and Network Administration
DoctorDirectory.com
http://www.doctordirectory.com