The fourth release of Adobe Shadow from Adobe labs is out and ready for download
Adobe Shadow is a new inspection and preview tool that allows front-end web developers and designers to work faster and more efficiently by streamlining the preview process, making it easier to customize websites for mobile devices.

This version of Shadow focuses primarily on the following:
Improved remote inspection
More reliable connections. 
Specify a different weinre server.
Screenshot feature updates 
UI improvements 

To download Shadow you will be needing Adobe ID and is available in Windows(windows 7 only) and Mac(OSX 10.6 and above) only.For mobile you will be needing Shadow client for iOS or Android device and the Google Chrome extension gives you the ability to browse on your desktop while all connected devices remain in sync.

Shadow for Mac-DMG with size 25.9 MB and Shadow for Windows-MSI with size 29.5 MB