avogadroapp
                                Avogadro is an advanced molecular editor designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science, and related areas.
                            
                        How to download and setup avogadroapp
Open terminal and run command
                                            git clone https://github.com/OpenChemistry/avogadroapp.git
                                        
                                        git clone is used to create a copy or clone of avogadroapp 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 avogadroapp https://github.com/OpenChemistry/avogadroapp/archive/master.zip
Or simply clone avogadroapp with SSH
                                            [email protected]:OpenChemistry/avogadroapp.git                                    
                                    If you have some problems with avogadroapp
You may open issue on avogadroapp support forum (system) here: https://github.com/OpenChemistry/avogadroapp/issuesSimilar to avogadroapp repositories
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