natural
General natural language (tokenizing, stemming (English, Russian, Spanish), part-of-speech tagging, sentiment analysis, classification, inflection, phonetics, tfidf, WordNet, jaro-winkler, Levenshtein distance, Dice's Coefficient) facilities for node.
wuzzy
library for simularity identification
trigram-similarity
Determining the similarity of alphanumeric text based on trigram matching
redis-search
redis-search is a very light-weight search engine for node.js using redis. This module is an implementation of [n-gram method](http://en.wikipedia.org/wiki/N-gram). This is a light general purpose search library that could be integrated into a blog, a documentation server, etc.