Autodesk Inventor, developed by U.S.-based software company Autodesk, is 3D mechanical CAD software for creating 3D digital prototypes used in the design, visualization and simulation of products.
NX, formerly known as NX Unigraphics or usually just U-G, is an advanced high-end CAD/CAM/CAE software package originally developed Unigraphics, but since 2007 by Siemens PLM Software.
CATIA (Computer Aided Three-dimensional Interactive Application) (in English usually pronounced /kəˈtiə/) is a multi-platform CAD/CAM/CAE commercial software suite developed by the French company Dassault Systèmes.
SOLIDWORKS (originally SolidWorks) is solid modeling CAD (computer-aided design) software that runs on Microsoft Windows and is since 1997 produced by Dassault Systèmes SOLIDWORKS Corp.