BootNeuter
BootNeuter will unlock your jailbroken iPhone 2G (running iOS 2.x or lower). It is available in the Cydia app store.
redsn0w
redsn0w is a utility that will jailbreak your iPhone or iPod Touch, allowing it to run apps that are not approved by Apple. r ...
Blacksn0w
Blacksn0w unlocks your jailbroken iPhone, allowing it to be used with any GSM carrier (AT&T and TMobile in the U.S.) witho ...
Ultrasn0w
Unlock your jailbroken iPhone with ultrasn0w, available from Cydia.
sn0wbreeze
sn0wbreeze is an advanced jailbreaking tool that lets you build a custom IPSW ("iPhone software") file. It allows you to jailb ...
PwnageTool
PwnageTool is an advanced jailbreaking application by the iPhone Dev Team for Mac OS X. It can build a pre-jailbroken .ipsw (" ...