LanguageTool

An open-source grammar, spelling and style checker supporting 30+ languages, usable on the web, in browser and office add-ons, or self-hosted on your own server for private proofreading. Works with LibreOffice, Microsoft Office and Google Docs.

• Open-source alternative to: Grammarly
• Licence: LGPL-2.1 (Weak copyleft open source)
• Website: https://languagetool.org
• Source code: https://github.com/languagetool-org/languagetool
• GitHub stars: 15222, forks: 1599
• Topics: grammar checker, proofreading, writing, spell check, style, grammar, natural-language, natural-language-processing, spellcheck, style-checker