Blender is a free and open source 3D Creation Software.

LibreCAD is a free Computer-aided design (CAD) application for 2D design. It works on Linux, OS X, Unix and Windows operating systems.

OpenSCAD is a free software application for creating solid 3D CAD (computer-aided design) objects.

BricsCAD is a software application for computer-aided design (CAD).

QCAD is a free computer-aided design (CAD) software for 2D design and drafting.

FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size.

DraftSight is a professional-grade 2D design and drafting solution.

BRL-CAD is a constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system. It includes an interactive geometry editor, ray tracing supp…

K-3D is a free 3D modeling and animation software.

Gmsh is a finite-element mesh generator.