Ironic is an Incubated OpenStack project which aims to provision bare metal machines instead of virtual machines, forked from the Nova Baremetal driver. It is best thought of as a bare metal hypervisor API and a set of plugins which interact with the bare metal hypervisors. By default, it will use PXE and IPMI in concert to provision and turn on/off machines, but Ironic also supports vendor-specific plugins which may implement additional functionality.
Project status, bugs, and blueprints are tracked on Launchpad:
http://launchpad.net/ironic
Developer documentation can be found here:
http://docs.openstack.org/developer/ironic
Additional resources are linked from the project wiki page:
https://wiki.openstack.org/wiki/Ironic
Anyone wishing to contribute to an OpenStack project should find plenty of helpful resources here:
https://wiki.openstack.org/wiki/HowToContribute
All OpenStack projects use Gerrit for code reviews. A good reference for that is here:
https://wiki.openstack.org/wiki/GerritWorkflow