Torben mentioned forking. One thing that is useful to point
out relative to *Nuke's is that there seem to be as many forks as there are developers and while google will return
an order of magnatude more hits for phpnuke it's not clear
that if what you want is to know what is changing, what the
release status is, or where to report or track a bug that
that is at all a benefit.
With OpenACS we have an architecture that is modular and
flexible enough and a community which is inclusive enough
that we have never forked. Not having forked means there
is no duplicated effort and no risk of being stranded on
a fork which loses support to another version.
