[CentOS] Open Source CPanel equivalent for CentOS?

Hi,

I was wondering if anyone knew of a solid, reliable Open Source equivalent of Cpanel/Plesk that I can run on my CentOS boxes. I've done some searching around and find a bunch of them which seem to have stopped or stalled development, but I am figuring that there has got to be a strong market / demand for something out there.

Is anyone using something secure, solid and complete? I don't need something for users to sign up themselves online, but would like something to give them abilities to administer their own domains. I am more than happy to move my entire existing mail server and accounts to something new if I can give my users this ability.

Thanks!

Eric