According to the Global Software Top 100 (2011 edition), 6 CAD/CAE/PLM software companies are among the the top 100. They are: Dassault Systèmes, Autodesk, PTC, Siemens (UGS),  Mentor Graphics   and ANSYS. Dassault  and Siemens have the most complete ecosystem: CAD-CAM-CAE-PLM.  Autodesk and PTC reply more on CAD. While Mentor Graphics has limited presence beyond  in electronics industry. ...