Free, open-source CAD where you write code to describe a model instead of drawing it. Ideal for parametric parts and customizers; many customizable models on Thingiverse and MakerWorld are OpenSCAD scripts. First released in 2010.
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SketchForge
sketchforge3d.com
A lightweight 3D modeler that runs in your browser and keeps your files on your own computer, with no account needed. It covers the essentials: primitive shapes, dimensioned alignment, sketch-based extrude and revolve,…
FreeCAD
freecad.org
Free, open-source parametric CAD for designing mechanical parts, enclosures and anything else that needs exact dimensions. It runs offline on Windows, Mac and Linux and exports STL, STEP and 3MF for printing. FreeCAD ha…
SolidVents
solidvents.com
Free web tool for generating parametric vent and surface patterns (Voronoi, hexagons and more) that you can export as 3D models and drop into your design. Handy for vents, grilles, speaker covers and decorative panels.