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

Blacksn0w

Blacksn0w unlocks your jailbroken iPhone, allowing it to be used with any GSM carrier (AT&T and TMobile in the U.S.) without a contract. It can be installed through blackra1n, the jailbreaking application by geohot.

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