Libraries and frameworks

Botkit: "Building blocks for building Slack bots" (Howdy via github.com)
Microsoft Bot Framework: Supports Cortana, Skype, Teams, Office 365 mail, Slack, Facebook Messenger, Skype for Business, and more. (Microsoft via dev.botframework.com)
BotMan: A framework agnostic PHP library for building chat bots. (Botman via github.com)
BotUI: JavaScript framework for building conversational UIs. (BotUI via botui.org)

List of Dirty, Naughty, Obscene, and Otherwise Bad Words: Not perfect, but useful for building your own list. (Shutterstock via github.com)
dariusk/wordfilter: a simple module for node.js, PHP, Python, and Ruby that lets you filter (bad) words (Darius Kazemi via github.com)

jimkang/iscool: Tool to help check if a string contains offensive or disrespectful language, or refers to a tragedy. (Jim Kang via npmjs.com)

RiveScript, see also bots using RiveScript
SuperScript: a dialog system and bot engine for conversational UI’s
ChatScript
- How to build your first chatbot using ChatScript (Giorgio Robino via freecodecamp.com)
ink: narrative scripting language

queneau-letters: node.js implementation of Queneau Assembly/Letter Chunks algorithm by Leonard Richardson
queneau-buckets: node.js implementation of Leonard Richardson’s Queneau Assembly buckets algorithm
kylestetz/Sentencer: madlibs-style sentence templating
jimkang/shakesnippet: provides a randomly chosen Shakespeare excerpt
spewer: a reverse part-of-speech tagger: give it a list of tags and it spews out matching language
shariq/burgundy: generates “aesthetically pleasing words”, see burgundy.io
Improv: a javascript library for generative text
incrediblesound/story-graph: the graph that generates stories
michaelpaulukonis/tagspewer: spew text based on pos-tagged-templates and associated lexicon; includes tools for parsing text and generating templates and lexicon

leonardr/olipy: Python library for artistic text generation
cblgh/storyteller: a templating language and python parser for generating small stories
nathanielksmith/prosaic: cut-up poetry generation over large corpora
ryankiros/neural-storyteller: recurrent neural network for generating little stories about images
mewo2/syllpos: a collection of wordlists

Bottery: a conversational agent prototyping platform (Google via github.com)
- Demo on Glitch (glitch.me, view source code)
Twine: an open-source tool for telling interactive, nonlinear stories
Twinecery: tool for authoring and implementing tracery grammars in Twine
The Poor Man’s Dialogue Tree (article)
Chat Mapper: offers a free version
Tree based tool to create dialog: question on rpg.stackexchange.com
Dialogue System for Unity: How To Manage Quests (article)
Walkie: Test copy, add attachments and share with your dev team.

zeke/cmu-pronouncing-dictionary: all the 134,000+ words in the CMU pronouncing dictionary as a simple JSON object
zeke/rhymes: “Give me an English word and I’ll give you a list of rhymes.” (uses zeke/cmu-pronouncing-dictionary)

aparrish/pronouncingpy: a simple interface for the CMU pronouncing dictionary, useful for finding rhymes

NLTK: platform for building Python programs to work with human language data
seatgeek/fuzzywuzzy: fuzzy string matching in Python, read more on chairnerd.seatgeek.com
karpathy/neuraltalk: Python+numpy project for learning Multimodal Recurrent Neural Networks that describe images with sentences
mewo2/syllpos: wordlists by part of speech and syllable count
hugovk/chroniclingamerica.py: a Python wrapper for the Chronicling America API
pteichman/quotefix: Insert matching punctuation for mismatched quotation marks, parentheses, etc. Good postprocessing for N-gram text synthesis.
interrogator/corpkit: a Python-based toolkit for working with linguistic corpora

facebookincubator/duckling: language, engine, and tooling for expressing, testing, and evaluating composable language rules on input strings (Haskell)

peterbraden/node-opencv: OpenCV Bindings for node.js. (Peter Braden via github.com)
nicolaspanel/numjs: node.js module for scientific computing with JavaScript and basic image processing. (Nicolas Panel via github.com)

nicolaspanel/numjs: node.js module for scientific computing with JavaScript and basic image processing. (Nicolas Panel via github.com)

google-spreadsheet: “a simple Node.js library to read and manipulate data in Google Spreadsheets”; also see this article on how it can be used

cheeriojs/cheerio: “fast, flexible, and lean implementation of core jQuery designed specifically for the server” (web scraping)
feedparser: a robust RSS Atom and RDF feed parsing using Isaac Schlueter’s sax parser