CyanogenMod is a free, community built, aftermarket firmware distribution of Android 4.1 (Jelly Bean), which is designed to increase performance and reliability over stock Android for your device.

CyanogenMod is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. CyanogenMod does still include various hardware-specific code, which is also slowly being open-sourced anyway.

All the source code for CyanogenMod is available in the CyanogenMod Github repo. And if you would like to contribute to CyanogenMod, please visit out Gerrit Code Review.

What are Nightly build ? : auto compile build from the CyanogenMod github, each time there are new corrections on it.
This version change each night, and aren't support officialy, if you find bugs/issues you can/must discuss here.


There are no Google Apps bundled with CM ROMs, because Google asked Cyanogen to remove copyrighted apps from his roms,
after flashing rom don't forget to flash Google Addon package if you want it.

Instructions:

Root the device and install ClockworkMod Recovery.
Perform a NANDroid backup of your current ROM.
Format the system, data & cache partitions of your device.
Perform a factory reset.
Flash CyanogenMod.
Optional: Install the Google Apps addon package.

Download Links:

http://adv.li/9zjn

GAPPS

http://adv.li/bzjn


Fonte: xda-developers.com

Tradução não pode ser feita porquê tou com problema no Navegador.^^