Yes, the Viewer is available via a browser so available on any device.
The viewer App is available on Windows and Apple App store for use on windows tablets and iPads.
Brainstorm can be downloaded for free on personal mobiles or users can access it on any device via a browser so can be used via desktops, laptops or any other device with a browser.
There is an App available for Windows, Apple and Android phones downloadable from the relevant app store for each device.
Yes, as it is browser based you just need a compatible browser on your device.
ENGAGE™ is a cloud hosted SAAS product which means there is no installation required of any software your network.