noweb bundle is a “literate programming tool” inspired by Knuth's Web. It needs executables that are provided only by some platforms (and the last build date is 2006), so probably they need to be rebuilt following the instructions.
It's not in TeX Live, so it cannot be installed with
tlmgr because the license is non free:
Noweb is copyright 1989-2006 by Norman Ramsey. All rights reserved.
You may use and distribute noweb for any purpose, for free. You may
modify noweb and create derived works, provided you retain the
copyright notice, but the result may not be called noweb without my
written consent. You may not sell noweb itself, but you may do
anything you like with programs created with noweb.
While the notice says the program is free, the way the license is written doesn't qualify it as “Free Software” in a strict sense. If you want to install and use
noweb, you have to do it yourself.