Android

Android is Google's mobile operating system. Android is based off Linux, and is completely open source. It is primarily written in Java, but also contains a small amount of other languages being that it is based off of Linux.

Android is completely open source, which means that any developer is free to download all of the code, and modify it in any way he wants. These Custom ROMs can be run on any rooted device.

Out of all popular mobile operating systems, Android is the most customizable. It allows developers to create apps that can do far more than any other mobile operating system will allow. This includes keyboard, launchers, and live wallpapers.

For a complete list of tutorials on Android, see Portal:Android.