Containerization-related stuff for Docker, Kubernetes (k8s), CoreOS, etc.
Also user-space stuff like Ubuntu snaps, flatpak, and AppImage is here.
Presentation: Docker without Docker
systemd and docker
Running Docker containers with systemd: Describes interfacing systemd and docker directly, along with the systemd-docker wrapper.
[[http://container-transform.readthedocs.io/en/latest/|container-transform tool]: can convert docker-compose.yml into systemd service units
For making sure themes are correct inside Flatpak applications:
KDE/flatpak-kde-applications: Official KDE repository for Flatpak-distributed applications