Office/HR Management Software for Unix?

skuzzlebutt asks: "If you are dragging your office (kicking and screaming, no less) into the dynamic and typically, more affordable world of Linux and Open Source to keep those licensing and external help desk call costs down, have you considered your Office Management Software needs yet? I'm talking about things like HR Management, Scheduling, and the like. Snooping around on Freshmeat and SourceForge, the pickin's were pretty slim (I found one package at SF, but it has been posted for a year with no file releases), and Google wasn't much help either. I work as a developer for B of A and am also an MBA candidate; between these two roles, I run into many small business owners who are complaining about licensing costs, limited support options, can't-upgrade-unless-we-get-that-$75M-grant, and so forth. Has anyone had any success/horror stories for particular pre-fab commercial packages (be they open, closed, gratis, paid, etc)?"