SketchUp Pro 2015 15.0.9350 (x86 /x64) Portable | 255 MB
Hundreds of thousands of professionals in (take a deep breath) architecture, construction, engineering, commercial interiors, light construction, landscape architecture, kitchen & bath design, urban planning, game design, film & stage, woodworking, and plenty of other fields use SketchUp Pro all the time, every day. It's the all-purpose antidote to complicated, expensive CAD software.