NLP常用开源/免费工具
（转载自水木社区NLP版）
*Computational Linguistics Toolbox
CLThttp://complingone.georgetown.edu/~linguist/compling.html
GATEhttp://gate.ac.uk/
Natural Language Toolkit(NLTK)http://nltk.org
MALLEThttp://mallet.cs.umass.edu/index.php/Main_Page
*English Stemmer
Snowballhttp://snowball.tartarus.org/
*English POS Tagger
Stanford POS Taggerhttp://nlp.stanford.edu/software/tagger.shtml
TreeTaggerhttp://www.ims.uni-stuttgart.de/projekte/corplex/TreeTagger/
*English Parser
Stanford Parserhttp://nlp.stanford.edu/software/lex-parser.shtml
Berkeley Parserhttp://nlp.cs.berkeley.edu/Main.html#Parsing
*English Keyphrase Extractor
KEAhttp://www.nzdl.org/Kea/index_old.html
*English Name Entity Recognizer
Stanford NERhttp://nlp.stanford.edu/software/CRF-NER.shtml
*Chinese Word Segmentator
中科院ICTCLAShttp://www.nlp.org.cn/project/project.php?proj_id=6
Stanford Word Segmenterhttp://nlp.stanford.edu/software/segmenter.shtml
*Topic Modeling Tools
Matlabhttp://psiexp.ss.uci.edu/research/programs_data/toolbox.htm
*Machine Learning Methods
CRF++http://crfpp.sourceforge.net/
LIBSVMhttp://www.csie.ntu.edu.tw/~cjlin/libsvm/
*Search Engines
Lucenehttp://lucene.apache.org/
中科院FirteXhttp://www.firtex.org/
*Data Mining Toolbox
Wekahttp://www.cs.waikato.ac.nz/ml/weka/
from: http://www.thuir.cn/cms/index.php?page=nlp | 
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