NLTK

nlppythontoolkitopen-source

Abstraction: Python Natural Language Toolkit for human language processing

Key points:

NLTK provides interfaces to over 50 corpora and lexical resources including WordNet
Supports tokenization, stemming, tagging, parsing, semantic reasoning, and named entity recognition
Free, open-source, community-driven; runs on Windows, macOS, and Linux
Cited as "a wonderful tool for teaching and working in computational linguistics using Python"
Accompanied by the book "Natural Language Processing with Python" by Bird, Loper, and Klein (O'Reilly, 2009); updated for Python 3 and NLTK 3
Includes wrappers for industrial-strength NLP libraries

Connections: Nltk · Natural Language Processing · Tokenization · Text Classification