LanguageTool is an Open Source proofreading software for English, French, German, Polish, Russian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect.
LanguageTool is freely available under the LGPL 2.1 or later.
For more information, please see our homepage at https://languagetool.org, this README, and CHANGES.
The development overview describes how you can contribute error detection rules.
See 'easy fix' issues for issues to get started.
For more technical details, see our wiki.
Before start: you will need to clone from GitHub (warning, 300+ MB download) and install Java 8 and Apache Maven.
In the root project folder, run:
mvn clean test
(sometimes you can skip Maven step for repeated builds)
./build.sh languagetool-standalone package -DskipTests
Test the result in languagetool-standalone/target/.
./build.sh languagetool-wikipedia package -DskipTests
Test the result in languagetool-wikipedia/target.
./build.sh languagetool-office-extension package -DskipTests
Test the result in languagetool-office-extension/target, rename the *.zip to *.oxt to install it in LibreOffice/OpenOffice.
Now you can use the bleeding edge development copy of LanguageTool *.jar files, be aware that it might contain regressions.