distributed monitoring with process control

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http://serverfault.com – I am searching a tool for monitoring my web apps, which are deployed accross several machines in the same VPN. However, besides the monitoring service, I would like to control my services (start|stop|restart) from a central place, preferentially web ui. I found Monit , and its great. But, the distributed version (M/Monit) is not free. there is some open source tool with these capabilities? (HowTos)