OpenSCAD

OpenSCAD is an open source programming language created in 2010.

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OpenSCAD is a free software application for creating solid 3D CAD (computer-aided design) objects. It is a script-only based modeller that uses its own description language; parts can be previewed, but it cannot be interactively selected or modified by mouse in the 3D view. An OpenSCAD script specifies geometric primitives (such as spheres, boxes, cylinders, etc.) and defines how they are modified and combined (for instance by intersection, difference, envelope combination and Minkowski sums) to render a 3D model. Read more on Wikipedia...

OpenSCAD Wikipedia page
There are at least 10,989 OpenSCAD repos on GitHub
OpenSCAD first developed in https://opencollective.com/openscad
file extensions for OpenSCAD include scad
The Google BigQuery Public Dataset GitHub snapshot shows 1k users using OpenSCAD in 2k repos on GitHub
Explore OpenSCAD snippets on Rosetta Code
GitHub supports syntax highlighting for OpenSCAD
See also: (5 related languages)OpenGL, Linux, FreeBSD, IA-32, AutoCAD DXF
Read more about OpenSCAD on the web: 1.

Example from the web:

 cube(5);
 x = 4+y;
 rotate(40) square(5,10);
 translate([10,5]) { circle(5); square(4); }
 rotate(60) color("red") { circle(5); square(4); }
 color("blue") { translate([5,3,0]) sphere(5); rotate([45,0,45]) { cylinder(10); cube([5,6,7]); } }

Example from Riju:

echo("Hello, world!");

Example from Linguist:

// Simple sphere in OpenSCAD

sphere( r=10 );

Feature	Supported	Token	Example
Line Comments	✓	//	// A comment
Comments	✓
Semantic Indentation	X

OpenSCAD - Programming language

Language features