Tinkerers and ROM creators will be interested to hear that Sony has moved the kernel source code from their Developer World portal to GitHub. Pop by the repositories and you'll find kernels for many of the major Xperia devices, like the Z Ultra and Z1, with more to come.
Good on Sony for providing the tools to developers to do what they want with their devices, particularly in an environment that they're familiar with and provides an easy workflow. Any developers interested in getting down and dirty with the code can head over to the GitHub page here. How many of you guys have dabbled in kernel code? What's your favorite custom ROM?
Source: Sony Developer World