Pub domain programs on ISC Unix

[Rajeev Seth]

I am looking for the binaries and/or customized source of
some of the good public domain programs that may be
already ported to Interactive Unix v. 2.2 to fill in some gaps which
exist in it. Programs like G++, ghostscript, bash etc. 

Does anyone have these that I can borrow or is there a site which
maintains these somewhere? Actually, something that runs on SCO unix may
also run on Interactive, so even such a site would be good enough.

Thank you.