remote operation or admin

[Chuck Robey]

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I have 4 computers, 1 big FreeBSD-current (4 x86 procs), 2 GentooLinux (1
is a dial AMD Opteron, the other a dual older x86), and 1 MacOSX (dual
PPC).  I was thinking about looking for two items, I'm not sure if I want
one or both of them: either some software to let me merely remotely manage
them (public software, mind) or, even better, something to get these
disparate hardwares to be able to work together, and (as much as possible)
to be able to share work.

What might be the best, in terms of ability, and especially the ability to
make these work together?  If they're not a FreeBSD port, as long as
they're reasonably stable, I don't mind porting things, but it needs to be
stable on all those CPUs.  Could you reo\commend me something?  I'll go
chase each one down, I won't jump on you if you're wrong, gimme your
guesses, ok?

Thanks
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