Download of NextSurface 2.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The program relates to System Tools. This free software for Mac OS X is an intellectual property of Andrea Medeghini.
From the developer:
NextSurface is a software app for creating interactive surfaces. NextSurface transforms any screen into a surface that people can simultaneously interact with, using hand gestures or pens, like on a physical whiteboard. NextSurface supports input devices such as Apple Trackpad or similar HID device.
NextSurface includes two applications for presentation and collaboration.
You may want to check out more Mac applications, such as Dock Delight, which might be similar to NextSurface.