Word Stemming Stemmers NLP Tools

Tools and libraries for reducing words to their root or base form through stemming algorithms across various languages. Includes language-specific stemmers, Porter stemming implementations, and multilingual stemming frameworks. Does NOT include lemmatization, morphological analysis beyond stemming, or general text normalization.

There are 53 word stemming stemmers tools tracked. 1 score above 70 (verified tier). The highest-rated is hplt-project/sacremoses at 71/100 with 495 stars and 2,424,232 monthly downloads.

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#	Tool	Score	Tier	Stars	Language
1	hplt-project/sacremoses Python port of Moses tokenizer, truecaser and normalizer	71	Verified	495	Python
2	adbar/simplemma Simple multilingual lemmatizer for Python, especially useful for speed and efficiency	54	Established	188	Python
3	winkjs/wink-porter2-stemmer Javascript Implementation of Porter Stemmer Algorithm V2 by Dr Martin F Porter	53	Established	20	JavaScript
4	sorenlind/lemmy 🤘Lemmy is a lemmatizer for Danish 🇩🇰 and Swedish 🇸🇪	49	Emerging	79	Python
5	htaghizadeh/PersianStemmer-Python PersianStemmer-Python	47	Emerging	52	Python
6	Blake-Madden/OleanderStemmingLibrary Porter stemming library (C++)	47	Emerging	55	C++
7	winkjs/wink-lemmatizer English lemmatizer	47	Emerging	69	JavaScript
8	WZBSocialScienceCenter/germalemma A lemmatizer for German language text	46	Emerging	94	Python
9	michmech/lemmatization-lists Machine-readable lists of lemma-token pairs in 23 languages.	43	Emerging	361	—
10	bastienbot/nlp-js-tools-french POS Tagger, lemmatizer and stemmer for french language in javascript	42	Emerging	37	JavaScript
11	damzaky/sastrawijs Indonesian language stemmer. Javascript port of PHP Sastrawi project.	42	Emerging	38	TypeScript
12	donderom/stemerge A collection of stemmers in Erlang 🌱	39	Emerging	4	Erlang
13	deniskyashif/ssfst Rewrite text in linear time.	37	Emerging	81	JavaScript
14	master/spark-stemming Spark MLlib wrapper for the Snowball framework	35	Emerging	34	Java
15	LeonieWeissweiler/CISTEM Stemmer for German	34	Emerging	45	C
16	yohasebe/lemmatizer Lemmatizer for text in English. Inspired by Python's...	33	Emerging	112	Ruby
17	xiamx/gen_fst Elixir module that implements a generic finite state transducer with...	32	Emerging	9	Elixir
18	xiamx/lemma A Morphological Parser (Analyser) / Lemmatizer written in Elixir.	32	Emerging	50	Elixir
19	putuwaw/linggapy Library for Stemming Balinese Text Language	32	Emerging	1	Python
20	luridarmawan/StemmingWord Tools StemmingWord berbasis web, menggunakan bahasa pascal dengan framework FastPlaz	31	Emerging	15	Pascal
21	zentrum-lexikographie/sfst-transduce Python bindings for SFST focusing on transducer usage	30	Emerging	4	C++
22	writecrow/lemmatizer A PHP library for getting a lemma from a given word, and getting a list of...	30	Emerging	13	PHP
23	htaghizadeh/JPersianStemmer Persian stemmer	30	Emerging	15	Java
24	FinNLP/lemmatizer 📦 English word lemmatizer	29	Experimental	17	TypeScript
25	dzieciou/pystempel Python port of Stempel, an algorithmic stemmer for Polish language.	27	Experimental	39	HTML
26	tokenmill/snowball Snowball version of the Porter stemmer for the Lithuanian language.	27	Experimental	7	—
27	Cirice/Ereina Language rules for Persian texts	26	Experimental	6	Haskell
28	SeekStorm/snowball-stemmers-rs snowball_stemmers_rs: a Snowball stemmer in 38 languages, in Rust	26	Experimental	1	Rust
29	andrianllmm/tagalog-stemmer A Python library for Tagalog word stemming	24	Experimental	1	Python
30	andrianllmm/aklanon-stemmer A Python library for Aklanon word stemming	24	Experimental	1	Python
31	naomilago/pt_lemmatizer This repo aims to store code for a Portuguese Lemmatizer, a PyPI package.	23	Experimental	2	Python
32	anishLearnsToCode/porter-stemmer Python Implimentation of the Famous Porter Stemmer Algorithm used in...	23	Experimental	2	Jupyter Notebook
33	kampsy/gwizo Simple Go implementation of the Porter Stemmer algorithm with powerful features.	23	Experimental	27	Go
34	htaghizadeh/PersianStemmer A New Rule-Based Persian Stemmer Using Regular Expression	23	Experimental	6	Pascal
35	stdlib-js/nlp-porter-stemmer Extract the stem of a given word.	22	Experimental	4	JavaScript
36	greenat92/arabicstemmer_frontend frontend web app for snowball arabic stemmer algorithm	22	Experimental	7	JavaScript
37	mshka/farsi_processor Farsi processor is a Ruby gem to process (stem and normalize) Persian/Farsi text	21	Experimental	8	Ruby
38	domPatera/stemmer-bundle This bundle integrates the dompat/stemmer library into Symfony. It provides...	20	Experimental	1	PHP
39	domPatera/stemmer PHP Library for word stemming. This library helps reduce words to their base...	20	Experimental	1	PHP
40	joom/Divan.hs Ottoman Divan poetry vezin checker in Haskell!	19	Experimental	39	Haskell
41	golang-nlp/stopwords Stopwords module for golang	17	Experimental	—	Go
42	Flight-School/lemma A command-line utility that lemmatizes words in natural language text.	16	Experimental	28	Swift
43	rojvv/rustress JavaScript library to mark stresses in Russian text.	15	Experimental	—	TypeScript
44	openderocknlp/extract-lemmatized-nonstop-words Extracts a pure list of stemmed words of a text filtered by stop words	13	Experimental	5	JavaScript
45	antonbaumann/german-go-stemmer An efficient implementation of the German porter-stemming algorithm in Golang.	13	Experimental	6	Go
46	N8Brooks/snowball ⛄ Snowball stemmers for Deno.	13	Experimental	5	JavaScript
47	ancatmara/early-irish-lemmatizer A DIL-based lemmatizer for Early Irish data.	12	Experimental	4	Jupyter Notebook
48	FinNLP/en-stemmer 📦 Porter stemmer implementation	11	Experimental	—	TypeScript
49	renan823/portuguese-stemmer Go implementation of Snowball Portuguese Stemmer	11	Experimental	—	Go
50	crlwingen/TagalogWordStemmer Tagalog Word Stemmer made with Java.	11	Experimental	—	Java
51	ontypehq/libfst Finite-state transducer library for text normalization	11	Experimental	—	Zig
52	olga-black/truecase_german A program for truecasing German text with incorrect capitalization	10	Experimental	1	Python
53	Wollaston/ArabicStemmer A small web app that uses NLTK's Arabic stemming algorithms to identify the...	10	Experimental	1	Svelte