Using Blender technology as the design engine, Fluid Designer enables you to design kitchens, closets, bathrooms, office spaces, and other interior spaces within a professional, modern drawing environment. Create powerful 3D presentations, project quotes, renderings, and animated or live walk-throughs. With pre-defined lighting environments, detailed material textures, and on the fly material changes, your projects can go from design to presentation faster than ever before.
If you are interested in getting involved in development view the documention on the Fluid Designer Wiki
Or get involved with Blender Development by visiting Blenders Website