When viewing a particular item, this recommender suggests other types of products based on which ones other customers have bought together.
For example, customers who bought a travel bag have also often bought a toiletry bag. This is similar to Amazon's book recommendations: "People who like x also like y".
Login: "freitag" / "freitag-DEMO"
Collaborative filtering recommender with pandas and opencv
The recommendations could be further refined, and the bulk of the effort would be to integrate this recommender into Freitag's online shop.