Android

Getting started:

Eclipse:

I recommend using these 3 links to get started if you have prior experience in Eclipse. Read them in this order.

Setting up your SDK

Programming guide

Sample code and tutorials

Netbeans:

If you have no experience with programming Java, I recommend Netbeans, since its easier to get started with.

Setting up Netbeans and a hello world

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GSM

GSM (PDF)

Links

App Inventor