VariCAD is a 2D/3D CAD package for mechanical engineering design that has been developed in the Czech Republic since 1988. It offers 3D modelling and 2D drafting with parameters and geometric constraints, tools for sheet metal, shells and pipelines, assemblies, bills of materials, libraries of standard parts such as screws, nuts and bearings, and calculation modules for springs, torsion, volume and mass, among others. You can exchange files in STEP and DWG, and DWG files are edited without conversion. VariCAD runs as a desktop application on Windows and Linux; a free trial and a free viewer are available.
VariCAD is developed by VariCAD s.r.o. in Liberec, Czech Republic, an EU member state. The package is proprietary and the source code is not public. Because it is installed locally, your drawings and models stay on your own systems and no vendor-hosted service moves data outside your environment. For a European organisation with requirements on data control, that is a simple setup that is easy to verify.