So these applications are called Leena Desktop UI Multi window launcher and Windroid Launcher. So you can download and integrate them on your smartphone.

Leena Desktop UI Multi window: The multi-window Leena Launcher (beta) brings the desktop operating system experience to your android device by extending Android with a native desktop user interface.

Apps included on Leena Desktop UI Multi window

- a native file manager app
- a native webbrowser app
- a native launcher app
- a native video player app (via file manager)
- a native image viewer app (via file manager)

Download https://play.google.com/store/apps/details?id=de.m_lang.leena

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