D + Qt + QtDesigner

[MGW]

> Do you have some code for us to play around with?

The video shows a download from github:
https://github.com/MGWL/QtE5

There is a folder examples/qte56help2
Copy files QtE56core.dll, QtE56widgets.dll (*.so for linux) into 
it and build the application:
1) rcc -binary a3.qrc -o a3.rcc
2) dmd qte56help2.d qte56.d lib56.d asc1251.d -release -J. -m64
Where rcc is the resource compiler for Qt.

For Linux - set LD_LIBRARY_PATH and run app.
export LD_LIBRARY_PATH=`pwd`; ./qte56help2