Add to PDP under the "You May Also Like" section taxon based relative products.
Add this line to your application's Gemfile:
gem 'spree_dyn_rel_prods', github: 'MateoLa/spree_dyn_rel_prods'
And then execute:
$ bundle install
$ bundle exec rails g spree_dyn_rel_prods:install
The gem is available as open source under the terms of the MIT License.