Text Layers that allow you to type text onto your canvas. Just recently, they also added grids that give you an imaginary grid for you to deform and draw on. Can only draw straight lines while they are turned on, so you'll have to either turn them off, or hit 'Disable Rulers' when not drawing a straight line. Perspective Layers which allow you to draw perspective guides or draw certain objects in perspective. These rulers can also be rotated, and the Circle Ruler can be deformed to draw circles in perspective. Ruler Tools that allows you to draw Straight Lines and Perfect Circles.
