FreeCAD
                                This is the official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.
                            
                        How to download and setup FreeCAD
Open terminal and run command
                                            git clone https://github.com/FreeCAD/FreeCAD.git
                                        
                                        git clone is used to create a copy or clone of FreeCAD 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 FreeCAD https://github.com/FreeCAD/FreeCAD/archive/master.zip
Or simply clone FreeCAD with SSH
                                            [email protected]:FreeCAD/FreeCAD.git                                    
                                    If you have some problems with FreeCAD
You may open issue on FreeCAD support forum (system) here: https://github.com/FreeCAD/FreeCAD/issuesSimilar to FreeCAD repositories
Here you may see FreeCAD alternatives and analogs
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