"App Inventor for Android
Create apps for your phone!
Creating an App Inventor app begins in your browser, where you design how the app will look. Then, like fitting together puzzle pieces, you set your app's behavior. All the while, through a live connection between your computer and your phone, your app appears on your phone. Read more..."
"This JavaScript tutorial contains hundreds of "Try it yourself" examples.
With our editor, you can edit JavaScript code online and click on a button to view the result."