Classroom Screen is a web based resource which produces a screen for IWBs and other screens and offers a range of tools which can be brought up onto the screen. It doesn't necessarily replace Smart Notebook or similar software, but would be useful for those situations where perhaps a license has lapsed, or there are issues with the software that comes with it.
The tools, which pop up immediately and can be moved around the screen or enlarged, include a timer, voting option, clock and calendar, and optional backgrounds, as well as others.
Here's a video showing all the details.
