Sweet Home 3D is a free, open-source interior design software that allows users to create 2D floor plans and 3D models of rooms and furniture. The software features a drag-and-drop interface, allowing users to easily create and rearrange rooms and furniture. Additionally, Sweet Home 3D includes a wide range of customizable furniture and textures, as well as the ability to import 3D models from other sources. Finally, the software includes a range of export options, allowing users to save their designs in a variety of formats, including 2D images, 3D models, and even VRML files.