Space.app 0.8 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Theming Tools, more precisely Multiple Desktops. 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.
From the developer:
Space.app provides "virtual workspaces" to help you to organize your use of the desktop. Space.app is provided free of charge for individual and commercial use under the QPL (version 1.0) and may be redistributed according to the terms of that license.
You may want to check out more Mac applications, such as Outer Space, App for Vine - Pro - Menu Tab or Nox App Player, which might be similar to Space.app.