Hi, if you're asking about a design software that will work for the MOD-t, almost any design software that will save a file as .STL, .OBJ or GCODE will work with the MOD-t. One program that we highly recommend is Tinkercad, which is a free, web-based design software. It's a great program for beginners and is a good fit for both adults and children. We also have this blog post that discusses other recommended design software, ranging from free to paid and for beginners to advanced designers. http://blog.newmatter.com/favorite-cad-programs/