What's a good program to jailbreak my iPhone 4S with?

I have the iPhone 4S v. 5.1.1, I want to jailbreak it.
I don't want my phone to be restored

Redsn0w. This is the one I used. And the most popular jailbreaking software out there. There's a website to get everything you need at redsn0w.us. They have the iOS files necessary to jailbreak and the software to do it.