Snap windows to 1/3 of screen

I've got two monitors side-by-side, one in landscape, and the other in portrait mode. For the portrait monitor, I would love to be able to snap windows to the bottom, middle, and top thirds of the screen. Halves is too much vertical screen space for most things I work on. Is there an application to customize the snap behavior to that extent?

Ubuntu 17.10

Solution 1:

Have a look at the gnome extension "gTile".

From the readme:

Gnome-shell extension that improves window tiling capabilities of stock gnome-shell. gTile is used to moves/resize windows on a configurable grid scheme.

When you click on the gTile icon it will open a dialog that lets you draw a region on an e. g. 1x3 grid. Once you have drawn the region gTile will move and resize the currently active windows to match that region on the real screen.

You can configure a hot key (for instance ctrl+alt+1) to send the current window to a specific field in an NxM grid. In your case it could be the first field in a 1x3 grid. Likewise for the other two windows.