Hi Guys,
The CAD software which specially focuses on mechanical CAD (MCAD) are as follows -
1) AutoCAD Design Suite and Autodesk Inventor which are developed by AutoCAD for 3D modeling
2) Pro Engineer, aka Creoparametric which is developed by Parametric Technology Corporation (PTC)
3) Catia which is developed by Dassault Systems
4) NX (Unigraphics or UG) is another well-known MCAD software developed by Siemens
5) Solid Edge is also been developed by Siemens and much more...

Thanks & Regards
Roger King