[https://www.atlassian.com/ Atlassian] uses OpenVZ in its private cloud (slides [http://www.slideshare.net/GoAtlassian/inside-the-atlassian-ondemand-private-cloud "Inside the Atlassian OnDemand Private Cloud"] (since slide 40)) and as environment [http://www.slideshare.net/PuppetLabs/1-m-pluginspuppetcamptokyo2014 "Puppet Camp Tokyo 2014: Fireballs, ice bats and 1,000,000 plugins: a story of continuous delivery"](slide 15).