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LanguageTool
A self-hosted grammar and style checker, the open-source alternative to Grammarly, running locally.
LanguageTool checks grammar, spelling, and style as things get typed, the same job Grammarly or Microsoft Editor do. Running it self-hosted means every sentence checked never has to leave this network to get corrected.
It works as a browser extension (Chrome, Firefox, Edge), so it checks writing anywhere on the web (Gmail, Google Docs, social media, any text box), not just one app. It also plugs into LibreOffice for offline documents.