FreeCAD is a general purpose parametric 3D CAD modeler. The development is completely Open Source (LGPL License). FreeCAD is aimed directly at mechanical engineering and product design but also fits in a wider range of uses around engineering, such as architecture or other...

Leading 3D CAD software for design, analysis, and product data management, developed by Dassault Systèmes. Enhances productivity, fosters collaboration, and accelerates time to market. Features include parametric modeling, photorealistic rendering, and strong PLM process support.

Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation. Free license available for students and hobbyists.

SolveSpace is a parametric 3D CAD program with extrude, revolve, union and difference functions. Save/Export as DXF, PDF, SVG, STL, STEP. Mesh generation expected by most 3d printers. Constraint solver point tracing for motion analysis.

Onshape is a professional CAD system – Parts, Assemblies, Drawings – with version control and collaboration built in. Each Onshape plan (Free, Education, Professional, and Enterprise) gives you all of the CAD and data management functionality with no time limit.

From design to manufacturing. Teams collaborate with more impact. Instinctive design meets multidevice capability and full interoperability for the ultimate 3D design workflow.

Software for 3D mechanical design, simulation, and visualization. Provides parametric, direct, and freeform design options, along with integrated simulation, CAM tools, and advanced rendering up to 16K resolution. Features include section views and customizable rendering environments.

DesignSpark Mechanical is a 3D modeling software reported to be easy to use so that all engineers will be able to create and share models.

KOMPAS-3D is for creating three-dimensional associative models for individual parts and assembly's containing both original and standardized elements. The parametric technology allows quickly obtaining models for typical products basing on a once designed prototype.

Cobalt is a parametric 3D modeling software for product design and development that's easy to use. It offers wireframe, solid and surface modeling with precision drawings, renderings and animation.