Packages 
Package Description
opennlp.tools.chunker
Package related to finding non-recursive syntactic annotation such as noun phrase chunks.
opennlp.tools.cmdline.chunker  
opennlp.tools.cmdline.dictionary  
opennlp.tools.cmdline.doccat  
opennlp.tools.cmdline.entitylinker  
opennlp.tools.cmdline.langdetect  
opennlp.tools.cmdline.languagemodel  
opennlp.tools.cmdline.lemmatizer
Classes giving access to the opennlp.tools.lemmatizer functionalities.
opennlp.tools.cmdline.namefind  
opennlp.tools.cmdline.params  
opennlp.tools.cmdline.parser  
opennlp.tools.cmdline.postag  
opennlp.tools.cmdline.sentdetect  
opennlp.tools.cmdline.tokenizer  
opennlp.tools.dictionary
Package related to parsing and storing dictionaries.
opennlp.tools.dictionary.serializer  
opennlp.tools.doccat
Package for classifying a document into a category.
opennlp.tools.entitylinker  
opennlp.tools.formats
Experimental package related to converting various corpora to OpenNLP Format.
opennlp.tools.formats.ad  
opennlp.tools.formats.brat  
opennlp.tools.formats.conllu  
opennlp.tools.formats.convert  
opennlp.tools.formats.frenchtreebank  
opennlp.tools.formats.irishsentencebank  
opennlp.tools.formats.leipzig  
opennlp.tools.formats.letsmt  
opennlp.tools.formats.masc  
opennlp.tools.formats.moses  
opennlp.tools.formats.muc  
opennlp.tools.formats.nkjp  
opennlp.tools.formats.ontonotes  
opennlp.tools.langdetect  
opennlp.tools.languagemodel
Package related to language models
opennlp.tools.lemmatizer
Package related with the lemmatizer tool
opennlp.tools.ml  
opennlp.tools.ml.maxent
Provides main functionality of the maxent package including data structures and algorithms for parameter estimation.
opennlp.tools.ml.maxent.io
Provides the I/O functionality of the maxent package including reading and writing models in several formats.
opennlp.tools.ml.maxent.quasinewton  
opennlp.tools.ml.model  
opennlp.tools.ml.naivebayes  
opennlp.tools.ml.perceptron  
opennlp.tools.namefind
Package related to finding proper names and numeric amounts.
opennlp.tools.ngram
Package related to computing and storing n-gram frequencies.
opennlp.tools.parser
Package containing common code for performing full syntactic parsing.
opennlp.tools.parser.chunking
Package containing code for performing full syntactic parsing using shift/reduce-style decisions.
opennlp.tools.parser.lang.en  
opennlp.tools.parser.lang.es  
opennlp.tools.parser.treeinsert
Package containing experimental code for performing full syntactic parsing using attachment decisions.
opennlp.tools.postag
Package related to part-of-speech tagging.
opennlp.tools.sentdetect
Package related to identifying sentece boundries.
opennlp.tools.sentdetect.lang  
opennlp.tools.sentdetect.lang.th
Package related to the processing of Thai data.
opennlp.tools.stemmer  
opennlp.tools.stemmer.snowball  
opennlp.tools.tokenize
Contains classes related to finding token or words in a string.
opennlp.tools.tokenize.lang  
opennlp.tools.tokenize.lang.en  
opennlp.tools.util
Package containing utility data structures and algorithms used by multiple other packages.
opennlp.tools.util.eval  
opennlp.tools.util.ext
Package containing extension loading code.
opennlp.tools.util.featuregen
This package contains classes for generating sequence features.
opennlp.tools.util.java  
opennlp.tools.util.model  
opennlp.tools.util.normalizer  
opennlp.tools.util.wordvector