How to download and setup docker-qt
Open terminal and run command
                                            git clone https://github.com/erstrom/docker-qt.git
                                        
                                        git clone is used to create a copy or clone of docker-qt repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with docker-qt https://github.com/erstrom/docker-qt/archive/master.zip
Or simply clone docker-qt with SSH
                                            [email protected]:erstrom/docker-qt.git                                    
                                    If you have some problems with docker-qt
You may open issue on docker-qt support forum (system) here: https://github.com/erstrom/docker-qt/issuesSimilar to docker-qt repositories
Here you may see docker-qt alternatives and analogs
openage tiled liteide qt qutebrowser MuseScore mapbox-gl-native qTox Clementine antimony flameshot gqrx mixxx appleseed pywebview toggldesktop edb-debugger openauto CuteMarkEd LibreCAD qgroundcontrol otter-browser feedback QDarkStyleSheet stellarium hotspot GoldenCheetah SlicerGitSVNArchive qtbase nitroshare-desktop