http://www.artifice.com/
http://www.artifice.com/free/lite_download_reg.html
3DesignWorkshop 7.8MB

The complete freeware DesignWorkshop Lite software package provides all you need to build your own 3D models for home design and visualization of architecture, landscapes, exhibits, or any kind of spatial design. With DesignWorkshop Lite you can view and walk-through ready-made models of any size, like the free 3D building models in the Great Buildings Online, in DXF, DesignWorkshop, or 3DMF format, with amazing live 3D speed. DesignWorkshop Lite can be used on any Power Macintosh, or any Pentium PC running Windows 95/98/ME/NT/XP/2000, with a recommended minimum of 32MB of real RAM for complete functionality. Your monitor should be set to at thousands or millions of colors (16, 24, or 32 bit color). 

Also free online from Artifice:   The DesignWorkshop Tutorials; the online DesignWorkshop User Guide; the 3D Objects Exchange, full of free downloadable 3D library objects for detailing your own home or office design; the Great Buildings Online, documenting 1000 great buildings from around the world and across history, with hundreds of photos and downloadable 3D models; and the Classic Home Collection of editable 3D home design models at ArchitectureWeek.