Recently Maven dropped support for 'nested modules' which was nice from an organizational point of view, but since all the maven modules shared one classpath in this case it wasn't really working. So I started using the 'import maven modules' after checking out the main project, which creates different project for each maven module. This works well, but it explodes the amount of project in my project explorer. I have been looking for a way to organize this and today I tripped over this article from Byron, about Categorization of projects in Eclipse using 'Working Sets'. This is what I had been looking for, and it was there all this time!