Samsung Kies is free software tool for Samsung Galaxy S3 so that you can update your phone when there is a new software update available or release by Samsung, and then you will enjoy more from new features, improvements and functionality that will be added to new software update.
About Samsung Kies
Samsung Kies connects your Samsung Galaxy S3 mobile phone to your personal computer, making it easier for you to synchronize data between devices and find new apps.
Keep your Samsung Galaxy S3 up to date.
When you connect your mobile device to Kies via a USB cable,
you will be automatically notified of any updates to your device firmware that are available.
Sync contacts with Outlook or Google, Yahoo
Add and edit contact of mobile on Kies conveniently.
Also, sync contacts with those of Outlook, Google or Yahoo.
Enrich your life with music wherever you are.
Make playlists and sync content between your mobile device and PC.
Carry your favourite music with everywhere with you.
Transfer your photos & videos to your PC.
Save those precious moments to your PC using Kies.
Windows data OS Windows XP, Windows Vista, Windows 7 (32/64bit are supported)
CPU Intel Core 2 Duo 2.0GHz or above (recommended)
Minimum memory size (RAM) 1.00GB (recommended)
Free hard drive space At least 500MB (recommended)
Screen resolution 1024 x 768(600), 32 bit or above
Required software Net Framework 3.5 SP1 or above, Windows Media Player 10 or above, DirectX 9.0C
* For Windows Mobile, ActiveSync (Windows XP) or Device Centre (Windows Vista/7)
Mac data OS MacOS X version 10.5 or later
CPU 1.8GHz Intel or faster processor
Minimum memory size (RAM) 512MB or more
Free hard drive space At least 100MB (recommended)
You can download Kies for Samsung Galaxy S3 in your local Samsung support websites, for English users you can download it here at Samsung UK Kies software.
source: Samsung UK