Free Tools for Information Retrieval?

Which freely avai开发者_JS百科lable tools are recommended for performing Information Retrieval using Generalized Vector Space, Naïve Bayes, and Fuzzy Set models?

Generalized Vector Space will probably be very hard to found. I know because I've implemented it for a college course. You can still get "Normal" Vector Space with Lucene. For the others I guess you can take a look at Mahout. The Naive Bayes classifier.

There is this post, i think it could be useful to create your own using TDIDF. It is a compromise and it is not complicated.

http://marcocattai.posterous.com/creating-a-simple-spotlight-search-using-core