Part-of-Speech Tagging NLP Tools

Tools and implementations for POS tagging across languages and methodologies (rule-based, neural, structured perceptron). Does NOT include morphological analysis, dependency parsing, or broader sequence labeling tasks beyond grammatical category assignment.

There are 44 part-of-speech tagging tools tracked. 1 score above 50 (established tier). The highest-rated is dnanhkhoa/python-vncorenlp at 52/100 with 58 stars. 1 of the top 10 are actively maintained.

Get all 44 projects as JSON

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#	Tool	Score	Tier	Stars	Language
1	dnanhkhoa/python-vncorenlp A Python wrapper for VnCoreNLP using a bidirectional communication channel.	52	Established	58	Python
2	datquocnguyen/RDRPOSTagger A fast and accurate POS and morphological tagging toolkit (EACL 2014)	48	Emerging	150	HTML
3	OpenSextant/SolrTextTagger A text tagger based on Lucene / Solr, using FST technology	47	Emerging	176	Java
4	ankane/informers Fast transformer inference for Ruby	46	Emerging	599	Ruby
5	bentrevett/pytorch-pos-tagging A tutorial on how to implement models for part-of-speech tagging using...	44	Emerging	179	Jupyter Notebook
6	nschneid/arabic-tagger AQMAR Arabic Tagger: Sequence tagger with cost-augmented structured...	43	Emerging	43	Java
7	Yinghao-Li/CHMM-ALT Code for "BERTifying the Hidden Markov Model for Multi-Source Weakly...	40	Emerging	32	Python
8	ppke-nlpg/purepos PurePos is an open source hybrid morphological tagger.	39	Emerging	16	Java
9	safakkbilici/x-tagger A Natural Language Processing toolkit for sequence labeling in its simplest form.	38	Emerging	9	Python
10	soheil-mp/Hidden-Markov-Model-POS Hidden Markov Model Part of Speech (POS) Tagger Project	37	Emerging	8	HTML
11	rjrequina/Cebuano-POS-Tagger Rule-Based Cebuano POS Tagger using Constraint-Based Grammar	36	Emerging	5	Jupyter Notebook
12	ngoquanghuy99/Hidden-Markov-Models-for-POS-Tagging An implementation of HMM (Hidden Markov Model) for POS Tagging	36	Emerging	15	Jupyter Notebook
13	vsimkus/pmr2024-hmm An official repository for tutorials of Probabilistic Modelling and...	33	Emerging	27	Jupyter Notebook
14	AMontgomerie/bulgarian-nlp POS tagging and NER for Bulgarian	33	Emerging	8	Jupyter Notebook
15	zhifac/crf4j a complete Java port of crfpp(crf++)	33	Emerging	32	Java
16	Rajspeaks/Machine-Learning-Approach-to-English-POS-Tagging-using-NLTK Machine Learning approach to English Corpus POS Tagging using NLTK. A mini...	32	Emerging	3	Jupyter Notebook
17	nai-php/NaiPosTagger A part of speech tagger written in PHP.	31	Emerging	14	PHP
18	Rajspeaks/Machine-Learning-approach-to-Bengali-POS-Tagging-using-NLTK Bengali POS Tagging using Indian Corpus through NLTK. A sample testing to...	31	Emerging	3	Jupyter Notebook
19	akshadashelar/Marathi_POS-tagger Unigram tagger technique for POS tagging.	29	Experimental	1	Jupyter Notebook
20	rahmed31/POS-Tagger This repository provides detailed steps to create a Part of Speech tagger...	27	Experimental	1	Python
21	PhuocSang16/CS221.N21 This is a course project for Natural Language Processing of UIT. The...	25	Experimental	5	Jupyter Notebook
22	Risha37/Arabic-POS-Tagger An implementation of a Rule-Based Part-of-Speech tagger for the Arabic language	24	Experimental	5	Python
23	Flight-School/pos A command-line utility for tagging part of speech for words in text.	23	Experimental	40	Swift
24	ratthapon/simple-sentence-recognition A simple sentence recognition using Hidden Markov Model, implement on MATLAB.	23	Experimental	3	Matlab
25	broepke/POS A Quick Guide to Part of Speech Tagging	23	Experimental	3	Jupyter Notebook
26	musyoku/unsupervised-pos-tagging 教師なし品詞タグ推定	23	Experimental	16	C++
27	AliNazariii/Part-of-Speech-Tagger A Part-Of-Speech (POS) Tagger	22	Experimental	2	Jupyter Notebook
28	AsadiAhmad/POS-Tagging POS tagging using the Viterbi algorithm and n-gram models	22	Experimental	5	Jupyter Notebook
29	Toure-exe/Hidden-Markov-Model-NER-tagging NER tagging with HMM and Viterbi algorithm	21	Experimental	1	Jupyter Notebook
30	ChaitanyaC22/Syntactic-Processing-POS-Tagger NLP: HMMs and Viterbi algorithm for POS tagging	19	Experimental	4	Jupyter Notebook
31	Rajspeaks/Machine-Learning-approach-to-Bengali-Corpus-Tokenization-Stemming-POS-Tagging-using-BNLTK Machine Learning approach to Bengali Corpus POS Tagging using BNLTK. This is...	19	Experimental	3	Jupyter Notebook
32	amirradnia99/persian-ner-pipeline A comprehensive Persian (Farsi) Named Entity Recognition (NER) pipeline...	19	Experimental	—	Python
33	Otosaku/OtosakuPOSTagger-iOS Swift library for Part-of-Speech tagging using BERT-based CoreML models....	19	Experimental	2	Swift
34	kulgg/ProbingPretrainedLM Probing Bert for part of speech (POS) and named entity recognition (NER) to...	19	Experimental	3	Python
35	iAmKankan/BERTPOSTAG In this project we will be performing one of the most famous task in the...	18	Experimental	2	Python
36	sumedhaagh/bengali-stemmer-nlp Rule-based Bengali stemmer that removes common suffixes to extract root...	11	Experimental	—	Python
37	emma-horton/viterbi-visualiser Interactive visualization of the Viterbi algorithm for part of speech tagging.	11	Experimental	1	HTML
38	kerryyys/UMH2025 Bridges the power of Hidden Markov Models (HMM) and Natural Language...	11	Experimental	1	Jupyter Notebook
39	suniljoshi00/hmm-pos-tagger Hidden Markov Model (HMM) based Part-of-Speech tagger implemented from...	11	Experimental	—	Python
40	vgherard/viterbi Viterbi algorithm for optimal paths in Hidden Markov Models	10	Experimental	2	C++
41	nkaush/pos-tagging A part-of-speech tagger NLP model implemented with the Viterbi algorithm...	10	Experimental	2	Rust
42	DorinK/NLP-Sequence-Tagging First Assignment in 'NLP - Natural Languages Processing' course by Prof....	10	Experimental	2	Python
43	mojtaba-khallash/semantic-tagger "SemanticTagger" package used for adding semantic feature to dependency...	10	Experimental	2	Java
44	mojtaba-khallash/pos-tagger "POSTagger" package can helps for predicting fine-grained and/or...	10	Experimental	2	Java

Comparisons in this category

Hidden-Markov-Model-POS and Hidden-Markov-Models-for-POS-Tagging (37 vs 36) Machine-Learning-Approach-to-English-POS-Tagging-using-NLTK and Machine-Learning-approach-to-Bengali-POS-Tagging-using-NLTK (32 vs 31)