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Harper is an English grammar checker designed to be just right. I created it after years of dealing with the shortcomings of the competition.
Langium is an open source language engineering tool with first-class support for the Language Server Protocol, written in TypeScript and running in Node.js.
Parser Building Toolkit for JavaScript.
Chevrotain is a blazing fast and feature rich Parser Building Toolkit for JavaScript with built-in support for LL(K). Grammars and 3rd party plugin for LL(*) grammars. It can be used to build parsers/compilers/interpreters for various use cases ranging from simple configuration files, to full-fledged programing languages.
Correcteur d'orthographe, de grammaire et de style en ligne.
LanguageTool est un correcteur en ligne gratuit pour le français, l'anglais, l'espagnol et plus de 20 autres langues. Il recherche instantanément les erreurs de grammaire et de style dans votre texte.
A French corpus with surface and deep syntactic annotations
Spell, Style, and Grammar Checker for WordPress, Firefox, TinyMCE, jQuery, and CKEditor
Grammalecte est un correcteur grammatical dédié à la langue française, pour LibreOffice & OpenOffice(.org). Il est dérivé de Lightproof, qui a été écrit pour le hongrois.
LanguageTool is an Open Source style and grammar proofreading software for English, French, German, Polish, Dutch, Romanian, and a lot of other languages. You can think of LanguageTool as a software to detect errors that a simple spell checker cannot detect, e.g. mixing up there/their, no/now etc. It can also detect some grammar mistakes. It does not include spell checking.