Best cracking tool

I want a free best cracking tool, name some suggestions

The only good cracking tool, is your own brain. There are no real "goto" tool, you take the tool that is up for the task upfront, combine it with knowledge of reverse engineering (which comes from studying) and then you have the basis of what you need. There's no one tool that can do the work for you, learn coding, learn assembly and study the protection (there are loads) and you'll have a base to work from.