I know a PHP coder who is working on such a beast as we speak, I don't really want to post his email address on here but if anyone pm's me I will pass their email address onto him.
He's about a week away from beta testing I think (I only know this because he gets a VPS from us that he's been using for testing)
His product has been developed to work on any server (I know he has tested it on plesk as thats what his box runs) and uses bind, basically it lets you run all of your dns from one server, add a zone, edit a zone, delete a zone, config the zone template etc.
It's not in production yet and I don't know the price or any other details but I'm sure he would be glad of any beta testers because he was just asking me how he could test on cpanel.