This is Linux Mint 19.1, codename Tessa.
Free Windows Alternative without telemetry which now Microsoft and Google use to spy on you and you do not have options to stop it.
Linux Mint 19.1 is a long term support release which will be supported until 2023. It comes with updated software and brings refinements and many new features to make your desktop experience more comfortable.
As you go through the “First Steps” section of the Linux Mint 19.1 welcome screen, you’ll be asked to choose your favorite desktop layout:
Cinnamon 4.0 ships with a brand new panel layout and thus with a new workflow. With a click of a button you’ll be able to switch back and forth between old and new and choose whichever default look pleases you the most.
The new panel ships with a window list with app grouping and window preview, a feature which has become the norm in other major desktop operating systems, whether it’s in the form of a dock (in Mac OS), a panel (in Windows) or a sidebar (in Ubuntu).
The panel looks more modern but it’s also much more configurable than before
Freeware, Official link: