I've written about Likewise Software a few times previously. Like many open source companies, Likewise offers a completely open, free (both libre, and gratis) version of its security and authentication software that's designed to simplify managing mixed networks. Up to this point, however, it's only been available for physical environments, not virtual servers.
Come June, this will no longer be the case. Citrix has integrated Likewise's Open software with its XenServer virtualization software, so that virtual servers running in mixed network environments can be secured just as easily as physical machines.
