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RedPen
An open source proofreading tool to check if your technical documents meet the writing standard; supports various markup text formats (Markdown, Textile, AsciiDoc, Re:VIEW, reStructuredText and LaTeX).
Website
|
Source
(Last update ~2019?)
Features
Language independent
Highly customizable
Multi platform (MacOS, Windows, and Linux)
Support various markup text formats (Wiki, Markdown, AsciiDoc, LaTeX, Re:VIEW, reStructuredText)
Plugin system: users can write their extensions with JavaScript
Annotation based error suppression
Practical REST API and UI
Tags:
tool
writing
proofreading
Last modified 03 November 2026