Mirantis made a gutsy move this week to find a way to allow its OpenStack cloud development software to run on Red Hat Enterprise Linux. This week Mirantis announced a partnership with Linux vendor SUSE, which will support RHEL implementations run by Mirantis customers.
Mirantis this week released an update to its distribution of OpenStack, based on the Mitaka release, that makes it simpler to manage the entire deployment lifecycle surrounding an OpenStack deployment.
There are many more companies that have been extremely successful around open source: Automattic makes money around WordPress; Acquia makes money around Drupal; Mirantis makes money around OpenStack; Docker and CoreOS make money around containers. And I can keep going.