LanguageTool

languagetool.org

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Open-source grammar, style, and spell checker supporting 30+ languages — a free, self-hostable alternative to Grammarly.

Why it is useful

LanguageTool catches grammar and style issues across far more languages than most competitors and offers a self-hosted server option for teams that don't want writing data sent to a third party. Browser extensions and editor integrations (LibreOffice, Google Docs) cover most of where Grammarly is typically used.