Being a backend Drupal specialist, I normally do not get too involved in the frontend side of things but being a well rounded technical resource I just cannot ignore tools which make life that much easier on projects.
Docx4j is an open source (ASLv2) Java library for creating and manipulating Microsoft Open XML (Word docx, Powerpoint pptx, and Excel xlsx) files. It is similar to Microsoft's OpenXML SDK, but for Java.
Recently, I started using Gulp.js on my projects to automate and enhance my workflow for the front-end part. I had the chance to experiment a few plugins and I will highlight 3 of them that I found very useful.