We'd like to encourage you to use the docx4j source code in your IDE, so we put this option near the top.
docx4j is in Maven Central: artifact details. See also the step-by-step guide.
latest binary release
docx4j only: docx4j-3.3.3.jar
(more information); if you are looking for particular dependencies, you can find them in this directory
docx4j + all dependencies: docx4j-community-3.3.3.zip
The latest nightly build can always be found in the /docx4j directory. The latest release is currently v3.3.3.