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