CrDroid is a ROM for the Samsung Galaxy Alpha that helps you maximize battery life and maintain utmost stability. It is based on Cyanogen Mod for Galaxy Alpha and also has some ingredients from Slim Roms, AOSPA, Omni Rom and so on.
before flashing, full backup including efs partition is necessary.
if you switch from stock rom, full wipe is necessary.
flash with custom recovery
this rom doesn’t have gapps included
this rom has own root support, but supersu installation is recommended
Download the ROM from here and flash it using CWM for Galaxy Alpha http://phoneprouser.com/download-samsung-galaxy-alpha-twrp-and-cwm-recovery-plus-rooting-tutorial/1089/.
There are some hiccups in this ROM. For instance you may experience poor audio quality and certain components like GPS, NFC will not work as well.