Download of Arkio 1.6 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. The software belongs to Design & Photo Tools. This free Mac application was originally designed by Arkio ehf. We recommend checking the downloaded files with any free antivirus.
From the developer:
Arkio is a collaborative design tool that enables you to easily sketch buildings, interiors and entire urban plans with others in VR as well as using your Mac, iPhone or iPad. Arkio for Mac is a companion app to Arkio in VR, enabling you to collaborate with other people wherever you are.
You may want to check out more software for Mac, such as Trapcode Echospace, ImageModeler or GroMobile, which might be similar to Arkio.