How to download and setup open-on-github
Open terminal and run command
                                            git clone https://github.com/atom/open-on-github.git
                                        
                                        git clone is used to create a copy or clone of open-on-github 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 open-on-github https://github.com/atom/open-on-github/archive/master.zip
Or simply clone open-on-github with SSH
                                            [email protected]:atom/open-on-github.git                                    
                                    If you have some problems with open-on-github
You may open issue on open-on-github support forum (system) here: https://github.com/atom/open-on-github/issuesSimilar to open-on-github repositories
Here you may see open-on-github alternatives and analogs
atom MagicPython Handlebars themecreator dracula-theme prettier-atom linter-eslint python-tools platformio-atom-ide codelf hydrogen teletype awesome-atom markdown-preview-enhanced go-plus atom-beautify simplepie atom-vim-mode-plus apm vienna-rss atomic-chrome miniflux-legacy merlin oneDNN atom gofeed seti-ui v2 atom-one-dark-terminal proton