Click on the following links. Please note these will open in a new window.

• Stanford CoreNLP toolkit
  A Java package for core NLP tasks
   

• NLTK (or Natural Language Toolkit)
  a collection of Python libraries for text processing

• LingPipe
  a Java toolkit with many text processing tools 

• Porter stemmer

• LDC
  The largest repository of linguistic data, including raw and annotated text collections