Split Screen Ultimate — Easiest way to resize and manage windows on your Mac.

http://spectacleapp.com/ is the same if not better, and it's free

bettertouchtool is the best tool you can hope for hands down (also free and continuously updated) http://www.bettertouchtool.net/

I don't know why this product was featured. Is it a promoted post?

I saw similar free versions of tools such as this one ph...what differentiates/makes unique this tool over its free/paid counterparts?

El Capitan will be offering this option — I think beta will be rolling out very soon. Not worth the $ imo.

How is this different from the in build Split-View option in OS X !?