Day 5 in the #vDM30in30 Cockpit is RedHat’s GUI for system administration. It’s actually installed on Fedora by default now, but it can run on most operating systems (there’s repos for Arch, Debian, CentOS and Ubuntu).
RedHat are already using it as the main way of interacting with RHEV, their libVirt virtualization platform and it’s installed as a part of OpenShift, their PaaS for container orchestration.
It includes a bunch of tooling for your standard sysadmin tasks: