Aegir
Aegir is an open-source hosting system. It started as an administration tool for Drupal websites, but it has since evolved significantly to include management of WordPress sites, complex development workflows, and many other things. I was a maintainer of Aegir and all of the related subprojects on Drupal.org for some time. During that time, I deployed Aegir at SLAC National Accelerator Laboratory and at NASA. Among other things, I developed the functionality that allows users to deploy sites from Git and the feature that aggregates update information from all managed sites within Aegir.
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