Hi guys. 
Please note
I discovered before one could use this tool effectively, the size of the layer it is used on
should be set to image size.
See Layer => Layer to Image Size
It is a bit slow on big canvas sizes though, but very powerful! 
Nice application of the tool. I haven’t tried it yet but examples I have been seeing are promising. Too bad it isn’t in the standard GIMP yet and my laptop isn’t powerful enough (probably).
Where can you find this tool?
You need to enable it in the GIMP preferences under “playground”
Which is standard? …Too bad it isn’t in the standard GIMP yet ?… I think you are a Windows user.
For Gimp 2.10 (Windows or linux) to enable the Playground options start Gimp with the switch --show-playground like the screenshot and go into Edit → Preferences.
Enable and restart Gimp and they are now in the toolbox
Still experimental, somewhat flakey, especially on large images.
What I meant was that I don’t have a use case for it yet, so I will wait until the tool is finished.
Thanks rich2005. Yes it works, but it still needs more refinement.
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Hi rich2005. Do you think this tool will be available soon as default?
It was part of a sponsored summer-of-code project. see: [Gimp-developer] N-Point deformation tool
I do not think there is any active development now, but you would really need to ask a developer.
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Thank you.