I got an email from Stéphane Droux, letting me know that the Vogoo Collaborative Filtering library (GPL) now supports the Item-Based Slope One Predictors Collaborative Filtering. If you are a company looking for collaborative filtering support, I think you ought to look at Vogoo.

Slope One is based on the surprising and simple realization that recommendations based on the average difference in ratings can match much more expensive algorithms while being orders of magnitude easier to maintain and implement.

Those who didn’t follow Slope One should know it is used by the DVD recommender site hitflip.de as well as by the MP3 recommender site InDiscover.net.

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