`Libbow' is a library of C code intended for writing statistical text-processing programs. Provided in the library distribution, there are currently three executable programs based on it.
* Rainbow is a program that does document classification.
While mostly designed for classification by naive
Bayes, it also provides TFIDF/Rocchio, Probabilistic Indexing and
K-nearest neighbor.
* Arrow an Altavista-like program for document retrieval. It
currently only performs simple TFIDF-based retrieval.
* Crossbow: a program for document clustering (and also classification).
Homepage: http://www.cs.cmu.edu/~mccallum/bow/