Hello! I am Kushiro. :)
Grid Modeler is a grid based tool for create mesh on top of another face easily. You can draw any shapes on the grid plane, then create new face / or boolean cut to it. You have all the shape tool : rotate, copy and paste, flip, scale, array, etc You can create the robots and spaceship very easily. (just like the one on the banner)
To celebrate the release of Version 1.9.0, now great discount and Grid Modeler is only $10 now (original $16).
You can read more about Grid Modeler on gumroad or my website. Thanks!