Openstack is a technology developed by a consortium of vendors to compete with Amazon. It is offered by a number of tech companies (Mirantis, Red Hat, Cisco, HPE) and is mostly used to let companies make-over their private data centers in the image of automated, efficient, public clouds.
It also helps companies share apps/data between their private data centers and a public cloud.
Average salary from Indeed jobs listings looking for this skill: $116,605