The best free Interior Design alternative to SOLIDWORKS is FreeCAD, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to SOLIDWORKS and four of them are free Interior Design Apps so hopefully you can find a suitable replacement. Other interesting free Interior Design App alternatives to SOLIDWORKS are LibreCAD, pCon.planner and Flatma.
A powerful open-source parametric 3D modeler ideal for mechanical engineering, supporting Python scripting, running on Windows, Linux, and Mac, with modular architecture allowing extensive adaptability and use with scientific computing libraries.
LibreCAD is an open source 2D CAD application for Windows, Apple and Linux. It is based on Qt, which is a leading cross-platform application and UI development framework.
The professional furnishing 2D-/3D-tool for everybody: The pCon.planner is a cost-free application allowing you to comfortably and professionally create complex furnishing concepts and to visualize them in a photo-realistic quality. File Formats: dwg, dxf, 3ds, skp, ... Language.
Flatma is a free online tool for designing custom furniture. Users can create 3D models, get cut lists, edge banding plans, and drilling diagrams.
Germany
EU
Netherlands
Kazakhstan
AS far as I have tried, FreeCAD is the only FOSS alternative to Solidworks/Catia/PTC that has a funtional workflow. It is the best of a poor bunch.