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…
Onshape
onshape.com
Professional parametric CAD that runs entirely in a web browser, with mobile apps for viewing and editing on the go. Files live in the cloud, so there's nothing to install and real-time collaboration is built in. The fr…
Shapr3D
shapr.com
Professional CAD designed around touch and Apple Pencil, with full versions for Windows and Mac. It's one of the most approachable precise-modeling tools: sketch, push and pull, then export STEP or STL. A free plan allo…
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.