Browsersync is described as 'makes your tweaking and testing faster by synchronising file changes and interactions across multiple devices. It’s wicked-fast and totally free'. There are three alternatives to Browsersync for a variety of platforms, including Mac, Windows, NOOK, Online / Web-based and Android. The best alternative is Ghostlab. It's not free, so if you're looking for a free alternative, you could try DOMScope or Muir.
Whether you want it or not, your site is going mobile - every day. Use Ghostlab to make sure all your users get the same neat experience - whatever operating system, browser or smart phone they are using.
Muir is a mobile browser testing app without all the strings of cloud based suites. Simply download the desktop app, install the client on your mobile devices, and get to work. - Browse to any web page in Chrome or Firefox. Your mobile devices will follow suit instantly.