NLTK 2.0 (Natural Language Tooklt) is a free, open source collection of Python modules, linguistic data and documentation for research and development in natural language processing and text analytics, with distributions for Windows, Mac OS X and Linux. It offers a platform for building Python programs to work with human language data, and integrates a guide to programming fundamentals.
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NLTK was used in these research abstracts https://dh2018.adho.org/en/measured-unrest-in-the-poetry-of-the-black-arts-movement/
https://dh2017.adho.org/abstracts/328/328.pdf