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Checkstyle is a tool for checking Java source code for adherence to a Code Standard
or set of validation rules (best practices).
The latest release version can be found at
GitHub releases
or at Maven repo.
Each-commit builds of maven artifacts can be found at
Maven Snapshot repository .
Documentation is available in HTML format, see https://checkstyle.org/checks.html.
Build instructions and Contribution
Explanation on how to create your own module
Continuous integration and Quality reports
Travis (Linux & MacOS build):
AppVeyor (Windows build):
Quality reports: https://checkstyle.org/project-reports.html
JavaScript, CSS and Java source file analysis on Codacy:
Feedback/Support
Please send any feedback to https://groups.google.com/forum/?hl=en#!forum/checkstyle
Questions and Answers from community: 
Bugs and Feature requests (not the questions): https://github.com/checkstyle/checkstyle/issues
Support/Sponsor checkstyle
If you want to speed up fixing of issue and want to encourage somebody in
internet to resolve any issue:
Licensing
This software is licensed under the terms in the file named "LICENSE" in this
directory.
The software uses the ANTLR package (https://www.antlr.org/). Its license terms
are in the file named "RIGHTS.antlr" in this directory.
This product includes software developed by
The Apache Software Foundation (http://www.apache.org/).
The software uses the Logging and Beanutils packages from the
Apache Commons project (http://commons.apache.org/). The license terms
of these packages are in the file named "LICENSE.apache20" in this
directory.
The software uses the Google Guava Libraries
(https://github.com/google/guava/). The license terms of
these packages are in the file named "LICENSE.apache20" in this
directory.
The software uses the Picocli Library
(https://github.com/remkop/picocli/). Its license terms
are in the file named "LICENSE.apache20" in this directory.