LanguageTool

Style and Grammar Checker for 25+ Languages

Why it is included

Instantly check grammar, punctuation, and spelling errors with LanguageTool's AI-powered grammar checker. Enhance your writing in over 30 languages with ease.

Best for

Users exploring vetted FOSS alternatives in this space (proofreading).

Target users

Developers, teams, and individuals evaluating open tools in this category — refine in CMS for specificity.

Strengths

~14,262 GitHub stars (per upstream list)
Open source

Limitations

Verify license, platform support, and security posture for your environment.

Good alternatives

Related tools

Office & Productivity
Grist
Grist is the evolution of spreadsheets.
Office & Productivity
WritingTools
The world's smartest system-wide grammar assistant; a better version of the Apple Intelligence Writing Tools. Works on Windows, Linux, & macOS, with the free Gemini API, local LLMs, & more.
Office & Productivity
Harper
Offline, privacy-first grammar checker. Fast, open-source, Rust-powered
Office & Productivity
OpenSign
🔥 The free & Open Source DocuSign alternative
Office & Productivity
Documenso
The Open Source DocuSign Alternative.
Office & Productivity
OCRmyPDF
OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched