An overlay is an installation of a networking component that is noninvasive to the wired infrastructure. Overlays generally employ tunneling techniques that connect end-point functionality to a central controller offering a variety of data, management and control plane functions.
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.