languagetool and grammared-language
The second tool is an ecosystem sibling, specifically an extension that integrates external machine learning models for improved grammar correction into the core functionality of the first tool.
About languagetool
languagetool-org/languagetool
Style and Grammar Checker for 25+ Languages
Detects complex errors beyond spelling (agreement, collocation, and style issues) through rule-based pattern matching and machine learning models. Exposes functionality via HTTP API, Java library, and standalone server deployments, with community Docker images available for quick containerization. Supports extensible rule contributions and integrates with LibreOffice/OpenOffice via plugin architecture.
About grammared-language
rayliuca/grammared-language
Adding Grammarly (and other) open source ML models to LanguageTool
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