What is the most commercial or common used design software?

I've been wondering what are the most common software used in industry for CAD/CAM. I'm a college student trained in AutoCAD 09, Solid Works & Feature Cam, but the more i learn the more I realize that there are a lot of softwares. And since I am in college, this is a good way to support myself. And i just wanted to see what programs are the best to learn while i can so i can have more options