need to monitor my website, network, performance and speds

i have a rack at a datacenter, 60mbps down x 32 mbps up

have a few production applications, websites hosted from this location

every now and then my websites are slow to load.  very slow.  

how can i monitor these websites and network performance?  what sort of software or monitoring tools are available?
sknoll84Asked:
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Fadi SODAH (aka madunix)Connect With a Mentor Chief Information Security Officer, CISA, CISSP, CFR, ICATE, MCSE, CCNA, CCNP, CCIP, SCSC and SCECommented:
As said above, I am runnig the combination Nagios + Cacti/MRTG. Nagios is been used for Alarms and Cacti/MRTG for Trending/Graphs.
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Ernie BeekExpertCommented:
Well, there a lot's of them.
PRTG is one of my favorites, but also have a look at this page: http://www.experts-exchange.com/Software/System_Utilities/Q_26748566.html?cid=748#a34841205

You might find something there you like.
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