I am looking for a software that can monitor my website for any downtime. I was looking for something that could monitor HTTP, POP, also I run Jakarta Tomcat and want to see if I have problems with that and to notify me.

I also want a software that I can include into my website under the help center so that users could go there to see the status of the network and if we are having problems. I am looking for something that is real-time.

Any thoughts would be great…

Software? Well not sure if this is what you're looking for, but a superb uptime monitoring utlity is alertra.com. It's quite costly, though, but well worth it.

siteuptime.com

I use it, although i dont often trust the figures that it gives. For instance its supposed to send you an email notificaion when your site goes down. I've recieved quite a few notifications and then I go check, but everything is working fine.

websitepulse.com and alertra.com

G

I would highly recommend Alertra, works very well :)

or you can install your own on a few remote servers. www.nagios.org

go to www.hotscripts.com and get a free php script.

Found URL of developer:
http://www.rushland.net/projects.htm

You can see the demo as well as download the script free.

Forgot to mention that I am monitoring about 40 servers. So it can scale well.

Yes. I used that on one of my site. It's a good script for simple monitoring.

Nagios.org is great also.. Give them a shot if you have a very low budget.

Have a look at N-View!
http://www.n-view.de

MRTG is great
Do a search on google :D

We use nagios (mentioned previously) to monitor the pingability of the servers, as well as each individual service running on the servers (IE DNS/SMTP/POP3/etc)...

If any 1 service goes down, we get alerted via pager. Very good piece of software if you have a spare server on a dedicated connection somewhere.

-David