The best Interior Design alternative to Rhinoceros is FreeCAD, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Rhinoceros and three of them are Interior Design Apps so hopefully you can find a suitable replacement. Other interesting Interior Design App alternatives to Rhinoceros are SketchUp 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.
Both are used for say interior/exterior design and both have v-ray render plugin (separate buy)
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.
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FreeCAD interface is less intuitive than some of the alternatives, but it mostly works. Overlapping fillet operations, however, can break down where other CAD software operates just fine. FreeCAD should be ok for simpler projects.