FreeBSD Project Page
FreeBSD 7.0 PPC Port
FreeBSD doesn't fully support PPC yet, but the work-in-progress pages are here:
FreeBSD PPC 7.0 and future testing release downloads:
Be sure to scroll to see latest releases.
FreeBSD 7.0 Hardware Notes (has yet to be compiled)
Perhaps YOU can help write it!
Not familiar with the vi editor to configure your new bsd system? EE or AE is included as a simpler alternative.