CRF++ is a simple, customizable, and open source 
implementation of Conditional Random Fields (CRFs)  
for segmenting/labeling sequential data. CRF++ is 
designed for generic purpose and will be applied to 
a variety of NLP tasks, such as Named Entity Recognition, 
Information Extraction and Text Chunking.

WWW:	http://chasen.org/~taku/software/CRF++/