Movie ratings dataset from the Movielens website, in various sizes ranging from demo to mid-size.
Large, metadata-rich, open source dataset on Kaggle that can be good for people experimenting with hybrid recommendation systems.
Music recommendation dataset with access to underlying social network and other metadata that can be useful for hybrid systems.
: From the Book-Crossing community. Contains 278,858 users providing 1,149,780 ratings about 271,379 books.
4.1 million continuous ratings (-10.00 to +10.00) of 100 jokes from 73,421 users.
Netflix released an anonymized version of their movie rating dataset; it consists of 100 million ratings, done by 480,000 users who have rated between 1...