The official site for Android developers. Provides the Android SDK and documentation for app developers and designers.
Windows 8 customers can update to Windows 8.1 starting from October 17th, 2013
Beginning October 17th, 2013, Windows 8 customers can update to Windows 8.1 for free in the Windows Store! With the return of the Start button, new ways to personalize your Start screen, and more ways to do more things at once, the new Windows gives you one experience for everything in your life.