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The OnMetal [1] team at Rackspace uses OpenStack Ironic.

It's saved us a lot of engineering time and let us offer the same interface as our VMs for provisioning baremetal machines with OpenStack Nova.

[1] http://www.rackspace.com/en-us/cloud/servers/onmetal

If you are not running OpenStack otherwise I'd say maintaining it is way to much effort to get relatively basic functionality. They also would still need custom work for asset databases, the memory checks, so they don't gain much.

A consultant from Ubuntu called Ironic a "still birth" and said its name was indicative of its fit with the rest of OpenStack. His team used MaaS which I gather serves most of the same purpose:

https://maas.ubuntu.com/

Breaking news: A consultant for a company trash talks an open source competitor.