sbt-unidoc
                                sbt plugin to create a unified Scaladoc or Javadoc API document across multiple subprojects.
                            
                        How to download and setup sbt-unidoc
Open terminal and run command
                                            git clone https://github.com/sbt/sbt-unidoc.git
                                        
                                        git clone is used to create a copy or clone of sbt-unidoc 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 sbt-unidoc https://github.com/sbt/sbt-unidoc/archive/master.zip
Or simply clone sbt-unidoc with SSH
                                            [email protected]:sbt/sbt-unidoc.git                                    
                                    If you have some problems with sbt-unidoc
You may open issue on sbt-unidoc support forum (system) here: https://github.com/sbt/sbt-unidoc/issuesSimilar to sbt-unidoc repositories
Here you may see sbt-unidoc alternatives and analogs
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