Original sentence: (A library, not open source.Below are links to software libraries that allow developers to add collaborative filtering to applications or web sites:.C/Matlab Toolkit for Collaborative Filtering - open-source, Matlab, C.CoFE - open-source, Java.Cofi - open-source, Java.ColFi - open-source, Java.Duine Recommender Framework - open-source, Java.Fast Maximum Margin Matrix Factorization - Matlab/Octave.Mahout (now incorporates project formerly called "Taste") - open-source, Java.RACOFI - open-source, Java.Rating-Based Item-to-Item - public domain, PHP.SUGGEST - Free, written in C.Vogoo PHP Lib - open-source, PHP