Mergely is a cool site that allows users to differentiate and merge documents in a browser. This is done by uploading or typing a document on the left side of the screen and then watching the changes occur on the right hand side of the screen. This is a handy tool for LA teachers teaching writing composition and showing how to edit a document. A nice feature is the ability to share a URL to share w/ others.
I recommend checking out Mergely by clicking here!!
Thanks to TXTNLRN Dan for the tip.