Its not really an applet - but @vlijm has been very creative with a nice GUI method to move/tile windows.
Need some feedback - thoughts?
Demo here - https://youtu.be/X3GM_tMlOs0
How to install and setup is described here https://github.com/UbuntuBudgie/experimental/tree/master/window_shuffler
This has now been added to 18.04. Just update as normal logout and login.
To activate window shuffled press meta-S I.e. Windows key and the S key.
Instructions will be given on first activation.
We would love to get your thoughts. @vlijm FYI
UB Dev Jacob has added a new feature to Window Shuffler
Available sometime over the weekend to 18.04 testers
And the final 18.04 release - full run through of the keyboard and GUI friendly capability
Make sure you are fully up to date and ensure the package budgie-desktop-environment is installed. That is all you need .
LOL I will try to find if I have that installed (or please let me know how as I am not a Linux Guru yet) and as for the WIndow Shuffler I will try to follow the steps 
JF
I’ll pass on it for now LOL
Will install it one day when there is a " Click here " way to install it or sudo apt install something from the CLI
I am not there yet
JF