CPanel DNS ONLY is a free product from CPanel that allows you to run a stand alone DNS server which will be automatically updated by any CPanel servers that you link to it running the cPanel Server Suite.
cPanel DNS ONLY is meant to be used on standalone DNS servers only which have no previous content on them. You can download it from cPanel - The Leading Control Panel.
Using DNS Clustering in WebHost Manager, you can create a cluster between your standalone name servers and any server running the cPanel and WHM. This means that any DNS changes made on your cPanel server will be sent to your standalone DNS server(s). You will no longer have to use local name servers with cPanel and WHM.