转自各种工具包的有效利用可以使研究者事半功倍。以下是NLP版版友们提供整理的NLP研究工具包。同时欢迎大家提供更多更好用的工具包，造福国内的NLP研究。*NLP Toolbox CLT GATE Natural Language Toolkit(NLTK) MALLET OpenNLP *English Stemmer Snowball *English POS Tagger Stanford POS Tagger TreeTagger TnT *English&Chinese Parser Stanford Parser Berkeley Parser *English Keyphrase Extractor KEA *English Name Entity Recognizer Stanford NER *Chinese Word Segmentator 中科院ICTCLAS Stanford Word Segmenter *Topic Modeling Tools Matlab GibbsLDA++ GLDA *Conditional Random Fields FlexCRFs 含有MPI并行版本。 CRF++ CRF Package CRF Matlab CRFSuit SGD with CRF HCRF *Support Vector Machine LIBSVM LIBLINEAR Pegasos *Search Engines Lucene 中科院FirteX *Machine Learning and Data Mining Toolbox Weka