The container orchestrator landscape

Systemd would be used for setting up the containers / cgroups yes. But, it's a very small, localised implementation detail really.

Twine (the external name, but more often called 'Tupperware' - probably the better name to use in searches) would be hard-to-impossible to make available to non-FB use, and probably mostly pointless. It is very heavily integrated in with lots of other Facebook infrastructure, from the CI system, to the automated fleet roll-out system of services, to the service discovery and routing system, etc., etc.