SOLIDWORKS, developed by Dassault Systèmes, is the most widely used CAD software for mechanical engineering, with millions of active licenses across industry and education. It is the standard for 3D part and assembly modeling in product development environments ranging from consumer products to industrial equipment. Other widely adopted tools include Siemens NX and PTC Creo, which are common in aerospace, automotive, and large-scale manufacturing due to their advanced surfacing, simulation, and PLM integration capabilities. Autodesk Inventor and Fusion 360 also see significant adoption, with Fusion 360 gaining traction among startups and smaller teams because of its cloud-based architecture and accessible pricing. CATIA, also from Dassault Systèmes, remains the dominant choice for complex surface modeling in aerospace and automotive OEMs. In practice, most large engineering organizations use more than one CAD platform — often across different divisions, product lines, or supplier networks — which makes CAD-agnostic collaboration and review tools increasingly important for maintaining consistency across the design process