JailbreakMe 2.0

Now that jailbreaking are now legal, it has never been easier to do. There is a Safari-based web app named JailbreakMe that jailbreaks your handset in a computer-free fashion. It's incredibly simple. It installs the app directory Cydia, which provides countless open-source apps that don't have to be approved by Apple. It has many emulators, themes, tweaks, and many (legal) repositories you can add that broadens your app selection.