There are many cam software that you can use them .
some of them have their own virtual 3d space and some sketching tools and can import solidworks files .
But some software like Solidcam and camworks , have not their own virtual 3d space and sketching tools . those are addin for solidworks.
It's up to you to choose one of them .
I have tested solidcam and i got it has great modules for speeding up the machining time.
Here is some pictures of solidcam for solidworks.