UPS monitoring software for Linux, FreeBSD and Solaris

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http://serverfault.com – Looking to configure auto shutdown for my servers once the UPS battery reaches a certain state. We have MGE / EATON Pulsar M3000 UPS units, and a heap of servers running Ubuntu, FreeBSD and Solaris - oh and windows. I am all very new to this, so I'm unsure if there is a standard program which I should be using. 'Nut' has been suggested. Has anyone had any experience with this? Any other recommendations? Thanks (HowTos)