AutoQ3D CAD is not a simple paint program, it's a full CAD application that let you make a lot of things in 2D and 3D. It is for everybody interested in 2D and 3D CAD as professionals, sketchers, architects, engineers, designers, students, and more.
It has surfaces support and 3D formats like STL, OBJ, DXF, and native 3DQ with textures. You can even print your drawings.