The best Interior Design alternative to SOLIDWORKS is FreeCAD, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to SOLIDWORKS and six of them are Interior Design Apps so hopefully you can find a suitable replacement. Other interesting Interior Design App alternatives to SOLIDWORKS are SketchUp, LibreCAD, pCon.planner and DDL - Digital Dry Layout.
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.
Comprehensive 3D modeling software ideal for architecture, engineering, film, and gaming. It includes features like easy-to-use interface, sun and shadow analysis, color experimenting, and mock-up creation. Available in freeware and professional versions for diverse needs.
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.
DDL (Digital Dry Layout) is the all-in-one platform built specifically for the natural stone industry. It covers the entire business cycle — from project planning and digital vein matching to warehouse management, sales, CRM, and online distribution.
Flatma is a free online tool for designing custom furniture. Users can create 3D models, get cut lists, edge banding plans, and drilling diagrams.
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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.