The headline feature of IsoSketch - IsoCrater is the starting point for any 3D sketch. Create cuboids in seconds and build up geometric objects ready to shape into great looking 3D drawings. The stand out part of this feature are the little bump stops - these stop you going too far, meaning every line finishes just where it should do.
If you're learning or teaching 3D drawing, this is the only tool that supports the process of 'crating' without using isometric paper or underlays. And it was designed and made right here in Britain! Brilliant.