So in layman's terms the original development forum will be for devs to post source built roms like aosp, aokp, aocp, cm9, PA, ext. while the android development will be for custom built roms based of stock firmware or leaks of said firmware, built thru a kitchen like DSIXDA's kitchen for example.
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Samsung Galaxy Note 3
: Xnote 7 4.3!
Samsung Galaxy Note: [ROM] JBSandwich CM9
Nexus 10: [ROM] ThunderKat 4.4.2