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openscad

"OpenSCAD is a free software application for creating solid 3D computer-aided design objects." - https://en.wikipedia.org/wiki/OpenSCAD

Examples

Rectangle

Ironically, to create a rectangle you use cube():

cube([100, 50, 25]);

Hollow cylendar

Make a hollow cylendar that is 200mm high and 100mm wide with 1mm walls:

difference() {
  cylinder(d=100, h=200, $fn = 100);
  cylinder(d=99, h=200, $fn = 100);
}

Note that if you set $fn = 4 you get a hollow rectangle.