Most useful application for project management and it is free. It is plain and simple, and you can include or exclude things you need for your project, for example you can only have microdocs, without tasks or you can only upload files, you can do whatever you want. What it lacks in design, you gain in really good functionalities, and it has chrome plugin, whit easy access to work log.

Easy to use, without any unncessary clutter.

Im eagerly waiting for a redesign ;)