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