couchdb
                                Seamless multi-primary syncing database with an intuitive HTTP/JSON API, designed for reliability
                            
                        How to download and setup couchdb
Open terminal and run command
                                            git clone https://github.com/apache/couchdb.git
                                        
                                        git clone is used to create a copy or clone of couchdb 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 couchdb https://github.com/apache/couchdb/archive/master.zip
Or simply clone couchdb with SSH
                                            [email protected]:apache/couchdb.git                                    
                                    If you have some problems with couchdb
You may open issue on couchdb support forum (system) here: https://github.com/apache/couchdb/issuesSimilar to couchdb repositories
Here you may see couchdb alternatives and analogs
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