Seth Grimes provides a quick Open Source Text Analytics that includes some of the following tools:

  • UIMA. Unstructured Information Management Architecture.
  • NLTK Natural Language Toolkit.
  • OpenNLP
  • GATE. General Architecture for Text Engineering.
  • ANLT. The Alvey Natural Language Tools.
  • Xtag. The XTAG Project.
  • RapidMiner
  • Uplug
  • SpeedBlue Wikipedia Clustering, Text Mining Software

Wikipedia provides another list of Natural language processing toolkits.

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