Amazon Kindle Paper White Kindle Jailbroken
It's a fairly simple process, as far as installing modified code goes. To perform the jailbreak, Kindle Paperwhite owners need only download a file and upload it to the root directory of their Paperwhite device via USB, and then restart. The code takes over and does the rest.
With a jailbroken Kindle Paperwhite, owners can install third-party apps, use the device as a weather display or even as a monitor connected to a Raspberry Pi, and other things. It essentially acts as a jailbroken Kindle, only with a far nice screen.
Before proceeding, be warned that if something goes wrong, the only way to restore/revive the device is with a serial port.