What do you think is the most reliable and also most widely used software for 3D modelling of mechanical parts?

solidworks is the most widely software for 3D modelling. because each 3.14 miles one user used this software.

there are numerous software available to get a a specified job done, for eg surface designing is best in catia V5, part modelling is best done in PRO-E.

so one should choose a right tool to a get a job done right.

There are many CAD softwares that can be used in 3D modelling like:( Solid works - CATIA - Rivet - Solid edge ,etc) and the best one is depending on your satisfaction , so if you master one of these software it will be the best one for you ,they are all good but just needs to focus on only one of them thank you :D.

Pro-E is one of the best. according to me the software in which the user has expertise is he best for that person.

yes i have designer 2D and 3D in Auto Cad

The most widely used is SolidWorks

Catia, Creo Parametrica and NX Unigraphics

Among various types of softwares i think Solidworks is best for modelling of mechanical parts. 

yes,obviously it is very helpfull

Solidworks is the most reliable in my point of view

NX cad is user friendly cad softwear for 3D modling,drafting,CAM,and aslo for simulation.