How to download and setup rccextended
Open terminal and run command
                                            git clone https://github.com/zedxxx/rccextended.git
                                        
                                        git clone is used to create a copy or clone of rccextended 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 rccextended https://github.com/zedxxx/rccextended/archive/master.zip
Or simply clone rccextended with SSH
                                            [email protected]:zedxxx/rccextended.git                                    
                                    If you have some problems with rccextended
You may open issue on rccextended support forum (system) here: https://github.com/zedxxx/rccextended/issuesSimilar to rccextended repositories
Here you may see rccextended 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