Launched: July 12, 2010

The beauty behind the App Inventor is it gives users a developer platform to build their own smartphones app: code-free. How so? Google's drag-and-drop GUI lets you visually design an application by dropping elements such as text boxes and labels onto a background: running pre-developed code blocks that link and function with each event. On top of that, Google gives you access to its Android APIs (text-to-speak capability, Twitter integration, etc). Best of all, it’s free. Seeing how the Android Market is on pace to pull in $15 billion by 2013, it's no surprise that Google plans on keeping the service open until the end of the year. But what about next year?