fillable-pdf
                                FillablePDF is an extremely simple and lightweight utility that bridges iText and Ruby in order to fill out fillable PDF forms or extract field values from previously filled out PDF forms.
                            
                        How to download and setup fillable-pdf
Open terminal and run command
                                            git clone https://github.com/vkononov/fillable-pdf.git
                                        
                                        git clone is used to create a copy or clone of fillable-pdf 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 fillable-pdf https://github.com/vkononov/fillable-pdf/archive/master.zip
Or simply clone fillable-pdf with SSH
                                            [email protected]:vkononov/fillable-pdf.git                                    
                                    If you have some problems with fillable-pdf
You may open issue on fillable-pdf support forum (system) here: https://github.com/vkononov/fillable-pdf/issuesSimilar to fillable-pdf repositories
Here you may see fillable-pdf alternatives and analogs
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