Working in most modern web browsers (Firefox 2+,Chrome, Internet Exporer 9+,Safari 3+ and Opera 9+), through its simple web interface, you simply need to upload 2 files to compare and Mergely, will highlights changes in the text.
If you are concerned about privacy (You should!!!), don’t fear, your documents never leave your browser, except if you save them, in that case a copy will be saved on the server.
But the best is to install it on your own server and here is how:
apt-get install libjs-jquery libjs-codemirror
2) Clone their git master branch into your /var/www
The most simple will be to directly clone their git repository. If you don’t have git install, simply run as root (or with sudo):
apt-get install git
and then, simply clone Mergely into your /var/www folder
cd /var/www git clone http://github.com/wickedest/Mergely.git
And you should now be able to access to Mergely web interface through http://YourIP/Mergely/editor