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