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Apache OpenNLP is a machine learning-based NLP library that provides tools for text-processing tasks such as tokenization, sentence segmentation, and named entity recognition.
NLP4J library is a toolset written in Java for Natural Language Processing. This version is oriented to DocumentClassification and uses Naive Bayes, TF-IDF, etc. There are also pre-processing tools.
A set of classes for Natural Language Processing in PHP for:
1. Part of speech Tagging - Brill, n-gram, HMM
2. Princeton Wordnet querying and access
3. Document summarization
4. Documentclassification - EM, Bayes
5. Stemming - Porter, Lancaster