Natural language Processing NLP common open source/free tools

NLP Common open source/free tools

(reproduced from the Water Wood Community NLP Edition)

*computational Linguistics Toolbox
CLT http://complingone.georgetown.edu/~linguist/compling.html
GATE http://gate.ac.uk/
Natural Language Toolkit (NLTK) http://nltk.org
Mallet Http://mallet.cs.umass.edu/index.php/Main_Page

*english Stemmer
Snowball http://snowball.tartarus.org/

*english POS Tagger
Stanford POS Tagger http://nlp.stanford.edu/software/tagger.shtml
Treetagger http://www.ims.uni-stuttgart.de/projekte/corplex/TreeTagger/

*english Parser
Stanford Parser http://nlp.stanford.edu/software/lex-parser.shtml
Berkeley Parser http://nlp.cs.berkeley.edu/Main.html#Parsing

*english Keyphrase Extractor
KEA http://www.nzdl.org/Kea/index_old.html
*english Name Entity recognizer
Stanford NER http://nlp.stanford.edu/software/CRF-NER.shtml

*chinese Word Segmentator
CAS Ictclas http://www.nlp.org.cn/project/project.php?proj_id=6
Stanford Word segmenterhttp://nlp.stanford.edu/software/segmenter.shtml

*topic Modeling Tools
Matlab http://psiexp.ss.uci.edu/research/programs_data/toolbox.htm

*machine Learning Methods
crf++ http://crfpp.sourceforge.net/
LIBSVM http://www.csie.ntu.edu.tw/~cjlin/libsvm/

*search Engines
Lucene http://lucene.apache.org/
CAS Firtex http://www.firtex.org/

*data Mining Toolbox
Weka http://www.cs.waikato.ac.nz/ml/weka/

From:http://www.thuir.cn/cms/index.php?page=nlp