I'm pleased to announce AdaStudio-2022 .
It based on Qt-6.3.0-everywhere opensource (expanded with modules from Qt-5.15: qtgraphicaleffects qtgamepad qtspeech qtx11extras qtwinextras),VTK-9.1.0,FFMPEG-5.1,OpenCV-4.5.5,SDL2-2.0.20,MDK-SDK(wang-bin)
Qt6ada version 6.3.0 open source and qt6base.dll ,qt6ext.dll (win64),libqt6base.so,libqt6txt.so(x86-64) built with Microsoft Visual Studio 2019 x64 Windows, gcc amd64 in Linux.
Package tested with gnat gpl 2020 ada compiler in Windows 64bit , Linux amd64 Debian 11.1
AdaStudio-2022 includes next modules : qt6ada,vtkada,qt6mdkada,qt6cvada(with face recognition) and voice recognizer.
Qt6Ada is built under  GNU LGPLv3 license https://www.gnu.org/licenses/lgpl-3.0.html.
Qt6Ada modules for Windows, Linux (Unix) are available from

Google drive https://drive.google.com/drive/folders/0B2QuZLoe-yiPbmNQRl83M1dTRVE?resourcekey=0-b-M35gZhynB6-LOQww33Tg&usp=sharing

WebPage is https://r3fowwcolhrzycn2yzlzzw-on.drv.tw/AdaStudio/index.html

Directories tree is
AdaStudio – root

Prebuilt - Qt-6.3.0, VTK-9.1.0, FFMPEG-5.1,Opencv-4.5.5,SDL2-2.0.20,MDK-SDK

Win64 - prebuilt for Windows x64
qt-6.3.0win64.tar.bz2 - Qt-6.3.0
vtk-9.1.0win64.tar.bz2 - VTK-9.1.0
ffmpeg5.1.win64.tar.bz2 - FFMPEG-5.1 + MDK-SDK
opencv4.5.5qt6.win64.tar.bz2 - OpenCV-4.5.5
sdl2win64.tar.bz2 - SDL2-2.0.20
AMD64 - prebuilt binaries for Linux/Unix Desktop amd64
qt-6.3.0amd64.tar.bz2 - Qt-6.3.0
vtk-9.1.0amd64.tar.bz2 - VTK-9.10
ffmpeg-5.1amd64.tar.bz2 - FFMPEG-5.1 + MDK_SDK
opencv-4.5.5amd64.tar.bz2 - OpenCV-4.5.5
sdl2-2.0.20amd64.tar.bz2 - SDL2-2.0.20
etc.tar.bz2 - environment and ld.so.config.d
qt6ada - qt6ada components
qt6adademos.tar.bz2 - qt6ada demos
qt6adasrc.tar.bz2 - qt6ada packages
qt6adawin64.tar.bz2 - qt6ada win64 binaries
qt6adax86-64.tar.bz2 - qt6ada x86-64 binaries

mdkada - qt6mdkada components
qt-qmdk.ads - qt6mdkada package
mdkadademos.tar.bz2 - qt6mdkada demos
mdkadawin64.tar.bz2 - qt6mdkada win64 binaries
mdkadaamd64.tar.bz2 - qt6mdkada amd64 binaries

qtopencvada - qt6opencvada components
qt6opencvadademos.tar.bz2 - qt6opencvada demos
qt6opencvadasrc.tar.bz2 - qt6opencvada packages
qt6opencvadawin64.tar.bz2 - qt6opencvada win64 binaries
qt6opencvadax86-64.tar.bz2 - qt6opencvada x86-64 binaries

voicerecognizer - qt6ada voicerecognizer components
qt6speech2textwin64.tar.bz2 - qt6voicerecognizerada win64 binries
qt6speech2textx86-64.tar.bz2 - qt6voicerecognizerada x86-64 binries
speech2textdemo.tar.bz2 - qt6voicerecognizerada demos
speech2textsrc.tar.bz2 - qt6voicerecognizerada packages

vtkada - vtk9ada componenets
vtkadademo.tar.bz2 - vtkada demos
vtkadasrc.tar.bz2 - vtkada packages
vtkadawin64.tar.bz2 - vtkada win64 binaries
vtkadax86-64.tar.bz2 - vtkada x86-64 binaries

The full list of released classes is in "Qt6 classes to Qt6Ada packages relation table.pdf"
The simple manual how to build Qt6Ada application can be readed in "How to use Qt6ada.pdf"  
If you have any problems or questions, tell me know.
Leonid(leonid.dulman@gmail.com)