Simple (freeware or open source) server monitor service

I'm looking for a piece of software which I can install on my client's Windows based servers which does the following:

1) Runs as a Windows Service
2) Monitors basic system health - CPU usage, Hard disk space, memory usage, the running state of services or tasks running on the server, RAID array health etc.
3) Monitors typical online services - HTTP, FTP, VPN, Ping tests etc.
4) Reports anomalies by sending an email

I'm looking for something fairly small, lightweight and simple, and hopefully free or open source, which I can install on all my client servers to warn me of servers that are about to run out of resources, or which are having service problems.
LVL 31
Frosty555Asked:
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mcsweenSr. Network AdministratorCommented:
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Chev_PCNCommented:
For a small environment, you could use something basic like Paessler:  http://www.paessler.com/tools
However, it would be better to buy in something like Solarwinds Orion NPM, which is inexpensive, easy to set up, and is very customisable.
http://www.solarwinds.com/products/orion/
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abolinhasCommented:
Hi,

Try server alive its free up to 10 server.
http://www.woodstone.nu/salive/
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Frosty555Author Commented:
All good suggestions. Points distributed based on what I can see supports my needs the best
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