There seems to be only a few ports of the old Adams concept into the digital world. No, I am not arguing about using a spot meter in the wildlife but for adjusting the zones of your picture by post production.
My favorite software for black and white landscapes is still the 2011 expired Lightzone from Lightcrafts ( the Tiffen Ozon did never work very well with CS 5) while I recently read on the
Lightzone Zombie page that LZ will be available to all of us soon.
BTW I am selling now “The Digital Zone System: Taking Control from Capture to Print” that has some nice introductory remarks but is rather useless when it comes to applying any correction to your picture.