Take a photo of your room, and see what the furniture you're about to buy would look like in various configurations. That's the premise behind virtual visual staging or space planning.
Most technology in this space renders computer objects that look similar to the furniture you're about to buy. VisualStager's technology takes photos and constructs them in 3D so you can move tables, chairs and plants around a room and they look real.
To help keep everything in perspective, the photo you start with is straightened by a clever algorithm. Then all the furniture is dropped in and looks 'right' at any angle.
The site is able to run entirely within a browser and has been optimised for tablet/touch usage.
Have a play here: http://www.visualstager.com/