mercury
                                Mercury Editor: The Rails WYSIWYG editor that allows embedding full page editing capabilities directly inline.
                            
                        How to download and setup mercury
Open terminal and run command
                                            git clone https://github.com/jejacks0n/mercury.git
                                        
                                        git clone is used to create a copy or clone of mercury 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 mercury https://github.com/jejacks0n/mercury/archive/master.zip
Or simply clone mercury with SSH
                                            [email protected]:jejacks0n/mercury.git                                    
                                    If you have some problems with mercury
You may open issue on mercury support forum (system) here: https://github.com/jejacks0n/mercury/issuesSimilar to mercury repositories
Here you may see mercury alternatives and analogs
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