X Windows is the software system written for managing windows under Unix. A graphics architecture, application programming interface (API) and prototype implementation developed by the Massachusetts Institute of Technology, X Windows defines a client/server relationship between the applications program and the workstation. It is not, however, a complete graphical user interface (GUI), but rather the basis upon which one can be built.
Already used by organizations world-wide a Project Management Tool!
Woffice comes with several built-in demos that you can install in one single click. You can test the available demos here and feel free to challenge any presented feature.