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