SolveSpace is a free (GPLv3) parametric 2d/3d CAD (computer-aided design) tool. Applications include:

<ul><li>Modeling 3d parts — draw with extrudes, revolves/helix, and Boolean operations</li><li>Modeling 2d parts — draw the part as a single section, and export; use 3d assembly to verify fit</li><li>Modeling 3d-printed parts — export the STL or other triangle mesh expected by most slicers</li><li>Preparing 2D CAM data — export 2d vector art for a waterjet machine or laser cutter</li><li>Mechanism design — use the constraint solver to simulate planar or spatial linkages</li><li>Plane and solid geometry — replace hand-solved trigonometry with a live dimensioned drawing</li></ul>