which is the most important software for a mechanical engineer these days?

i want to know that what are the important software a student needs to learn about in the college life to be mostly prepared for a job. Is there any sequence in which these software should be learnt ? and yes one other thing i wanted to know is which software is the most important one??

Delearn before you learn any software...
First understand what does a software does for a mechanical engineer's job...
I as a mechanical job recruiter, am unable to answer your incomplete question.
What do u do.. u r aim.. u r area of interest.. what job are u targeting.. whats u r nearby future plan..

I can name any damn drafting or modelling software's... but it's of no use as far as core mechanical engineering is concerned. U will come to know this very soon.