Version 0.1 of package Windresize has just been released in GNU ELPA. You can now find it in M-x list-packages RET.
Windresize describes itself as: ============================ Resize windows interactively ============================ More at https://elpa.gnu.org/packages/windresize.html ## Summary: This mode lets you edit the window configuration interactively just by using the keyboard. To use it, type M-x windresize; this puts Emacs in a state where the up/down and left/right arrow keys resize the window dimensions. To return Emacs to its ordinary state, type RET. ## Recent NEWS: [Not provided 🙁]