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| Brill tagger - a very fast POS tagger.
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| CST's Part-Of-Speech tagger (Brill, with adaptations) |
| CyGreedy - A super-fast POS tagger.
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| FACTORIE - is a toolkit for deployable probabilistic modeling, implemented as a software library in Scala. It provides its users with a succinct language for creating relational factor graphs, estimating parameters and performing inference.
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| FANSE parser - has a very good accuracy as a semantic role labeler.
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| FreeLing - A comprehensive toolkit that includes tokenization, morphology, POS tagging, NER, and dependency parsing modules for various languages.
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| GATE Twitter POS tagger |
| GENIA - (POS) part-of-speech tagging, shallow parsing, and named entity recognition for biomedical text
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| HunPos - an open source trigram tagger.
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| LTAG-spinal |
| MedPost - part of speech tagger for the BIO domain |
| MontyLingua - A light-weight barebones NLP toolkit (lemmatization, POS-tagging, chunking, and basic semantic parsing)
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| NLP4j - NLP tools from Emory university (a former ClearNLP and ClearParser)
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| Pattern - is a web mining module for the Python programming language. It has tools for data mining (Google, Twitter and Wikipedia API, a web crawler, a HTML DOM parser), natural language processing (part-of-speech taggers, n-gram search, sentiment analysis, WordNet), machine learning (vector space model, clustering, SVM), network analysis and visualization.
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| SENNA - Semantic Role Labeling (PropBank style), part of speech (POS) tagging, chunking, named entity recognition, syntactic parsing.
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| spaCy - A fast but accurate POS tagger and dependency parser.
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| SVMTool - an open source generator of sequential taggers.
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| TnT -- Statistical Part-of-Speech Tagging - Highly efficient POS tagger for English and German.
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| Twitter POS |
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