PS Oh by the way Burt Rutan used Ashlars Cobalt program to design SpaceShipOne That alone is sufficient to establish that the program has sufficient notability for inclusion in this list and to have an article on it on the project Only someone with extraordinarily limited understanding of CAD programs would think Burt Rutan would be using some sort of backwater CAD program few have heard of to design a space ship And since I actually have some wellearned gray hairs on my head and had used a wide variety of CAD programs before the Internet became all the rage I longago read in an actual magazine think Internet made out of trees about how Burt Rutan used Ashlar Vellum the wireframe D predecessor of Cobalt to design the Voyager plane that flew nonstop around the world