Apologies, I forgot to include a link: The toolkit is now at https://github.com/att/ast since AT&T laid off the group a couple years ago.
About half the package consists of evolutions of traditional Unix commands. The parts I use regularly are ksh and tw. tw ('tree walk') is sort of a 'find --exec' replacement with a C-like selector syntax. It's a bit verbose, so for interactive use I generally set up project-specific shell aliases with selection expressions, e.g.