Hey everyone, I've been using FreeBSD for about 2 years now, and I've loved every minute of it. I've been discovering new programs/tools almost every week that do something that just make me think "damn, that was cool!" I was thinking it would be helpful to newcomers, as well as users like myself, and even maybe experienced gurus, to make up a list of awesome sysadmin software. Such as sysutils like portupgrade, lsof, mtr, and other software like cacti, whatmask, cmdwatch, and daemontools. So, what's your favorite FreeBSD sysadmin tool? Please include a quick description of it.