oVirt Node is the open-source counterpart to RHEV-H. In oVirt 3.6 it is based on CentOS 7. previously we had also buiolds based on CentOS 6 and Fedora.

You can read more about it here: http://www.ovirt.org/Node

As oVirt Node is based on and very much integrated with Fedora's / CentOS's LiveCD mechanism, which prevents to build Node based on i.e. Gentoo or Debian.

I have no idea what RHEV-H does but knowing Red Hat, the packages they ship are all open source so CentOS or Debian will ship them. Maybe they won't be as cleanly packaged and you'll need to do more studying, reading, asking and configuring on your own.

Regarding RHEV builds for qemu-kvm virtualization , there is analog on CentOS 7.1 :-
http://cbs.centos.org/koji/buildinfo?...
Information for build qemu-kvm-ev-2.1.2-23.el7.1