Sketchup is a free design program that is perfect if you want to work on architectural designs with none of the hassle.Working with design applications can be a complicated & burden some task but not when it comes to Sketchup.This free software allows you to create designs for architecture,mechanics,video games & much more while remaining intuitive & simple to use.The softwares creators say they aimed to recreate the freedom of working with a pen & paper in a computer design