Join NX CAD at Excelling Technologies. NX, formerly known as "UG". In 2000 Unigraphics purchased SDRC I-DEAS and began an effort to integrate aspects of both software packages into a single product which became Unigraphics NX or NX. NX is an advanced high-end CAD/CAM/CAE, which has been owned since 2007 by Siemens PLM Software. Siemens NX has advance tools due to which Mercedes shifted to Siemens NX from CATIA in 2010.