I generally use AutoCAD for my drafting needs, but often a client will ask for a simple, quick, floor plan. So, I’ve started using the App, MagicPlan. I find the tool to be incredibly clever and very handy! The program is updated frequently and the developers ask for feedback from Interior Designers and Architects (which makes it so great). Many tools are available for designers, but if you are looking to create basic floor plans, quickly and very easily, this is a great program for everyone. It's worth checking out.