Android —— releases of AOSP

Android 6.0 release (Marshmallow).
Android 5.0 release (Lollipop).
Android 4.4 release (KitKat).
Android 4.3 release (Jelly Bean).
Android 4.0 release (Ice Cream Sandwich).
Android 3.2 release (Honeycomb).
Android 2.3 release (Gingerbread).
Android 2.2 release (Froyo).
Android 2.1 release (Eclair).
Android 1.6 release (Donut).
Android 1.5 release (Cupcake).