I use some wmutils to complement the wm I'm writing.
At first, my wm didn't support window moving and resizing with the mouse, so I used wmutils' xmmv and xmrs in order to do it (I think tudurom's windowchef followed this same path). Now that I have implemented them, I use the non-mouse counterparts of those programs: wmv and wrs for key binding.

In a later moment, I think in get rid of my wm and go full wmutils, but I still heavily depend on EWMH hints, so having a wm behind the scenes is very useful. And also there are some features that I really want and that would be hard to implement with wmutils, features which induced me to write a window manager: mainly smart-placing of windows when opening them. I think glazier does something alike by placing new windows below the cursor, but I wanted something that places new windows in a blank area on the screen, where there are no (or few) window.

I am, however, very interested in how people implement window tiling with wmutils, considering the variables such as:
• changing tiling layout
• monitor boundaries
• tiling in different workspaces/groups
• whether window state can switch between floating and tiling, and whether to keep track of its status and position
• and whether the script auto-tiles windows when changing workspace/group or opening/closing a window.