LanguageTool
Grammar & editingOpen-source grammar and style checker with self-hosting option
- Stars
- ★ 15.2k
- Licence
- LGPL-2.1
- Updated
Alternative to Grammarly, ProWritingAid
Vale
Command-line prose linter with custom style guides
★ Stars6.3k6,258 on GitHub
Last commit16 Oct 2026
LicenceMITSPDX, from the repository
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From GitHub, fetched 19 Oct 2026.
Vale is an open-source prose linter you run locally or in CI. You bring your own style rules (including Microsoft, Google and custom guides) so editorial standards stay in version control.
Free alternative to
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