Samsung Galaxy S III’s one of the biggest feature, S Voice App, similar to Siri from Apple. Now this App is available to all ICS devices. After its initial firmware leak developers managed to extract out S-Voice APK from firmware. Now its available for download and its compatible with all ICS running devices. Some devices are facing crashes during and after installations.
You can install it by coping the app into your System/App folder and alter the permissions or by simple installtion. Its better than Google Voice but not that good like that of Siri.
Download Now: XDA Developers