redsn0w

redsn0w is a utility that will jailbreak your iPhone or iPod Touch, allowing it to run apps that are not approved by Apple. redsn0w can perform an untethered jailbreak of iOS 5.0.1 for all iPhones, iPod Touches, and iPads.

Free Mac OS X Windows Linux

PwnageTool

PwnageTool is an advanced jailbreaking application by the iPhone Dev Team for Mac OS X. It can build a pre-jailbroken .

Free Mac OS X

sn0wbreeze

sn0wbreeze is an advanced jailbreaking tool that lets you build a custom IPSW ("iPhone software") file. It allows you to jailbreak your iPod or iPhone, so that it can run apps unapproved by Apple.

Free Open Source Windows

Ultrasn0w

Unlock your jailbroken iPhone with ultrasn0w, available from Cydia.

Free iPhone

BootNeuter

BootNeuter will unlock your jailbroken iPhone 2G (running iOS 2.x or lower). It is available in the Cydia app store.

Free iPhone