docx4j

Plutext's flagship product is docx4j. 

Java developers use docx4j to create Microsoft Word docx documents using data from enterprise systems, and to convert docx to HTML and PDF.

docx4j is open source. You can find out more at dev.plutext.org

PLutext can help you to deliver solutions you are building around docx4j.

MergeDocx

MergeDocx is a paid extension for docx4j, which makes it easy for Java developers to merge/concatenate/append/join docx documents into a single docx.  It can also process altChunk elements.

It gives you control over styles, page numbering, page breaks, and headers/footers in the merged document.

You can  read a bit more about it in our original announcement blog post, or email sales@plutext.com if you want to explore further.