That are kernel sources. Using those sources, you can compile a custom (homemade) kernel. They also make it easier to build aftermarket firmwares such as CyanogenMod or Omni.
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If you like my work, please feel free to donate. The money will be spent on a new build server...
And in case you want to report a bug in any of my ROMs, please...
don't report issues that have already been mentioned.
use DevDB whenever possible. This keeps the threads clean.