natural language processing tools

https://languagetool.org/

https://www.grammarly.com/

https://sapling.ai/

Perfect Tense https://www.perfecttense.com/

Language Tool Plus https://languagetoolplus.com/

Pro Writing Aid https://prowritingaid.com/

Grammar Bot https://www.grammarbot.io/

Text Gears https://textgears.com/

Bing Spell Check https://azure.microsoft.com/en-in/services/cognitive-services/spell-check/

After the Deadline https://www.afterthedeadline.com/api.slp

STANDS4 Grammar API https://www.grammar.com/grammar_api.php

Web Spell Checker https://webspellchecker.com/

JSpell Checker https://rapidapi.com/jspell/api/jspell-checker

Scribens https://scribens.com

Virtual Writing Tutor https://virtualwritingtutor.com

grammar-check https://pypi.org/project/grammar-check/

GRAC http://grac.sourceforge.net/

Graviax Grammar Checker https://sourceforge.net/projects/graviax/

Grammarly @edu https://grammarly.com/edu

Reverso Speller https://reverso.net/spell-checker/english-spelling-grammar/

Ginger Software https://gingersoftware.com

WhiteSmoke https://whitesmoke.com

Linguix for Education https://linguix.com/edu

RobotDon https://robotdon.com

SentenceChecker.org https://sentencechecker.org

GrammarCheck https://grammarcheck.net/editor

Slick Write https://slickwrite.com

Google Early Adopter Program Google docs

Online Correction.com https://onlinecorrection.com

Hemingway Editor https://hemingwayapp.com

PaperRater https://paperrater.com

Spell Check Plus https://spellcheckplus.com