elementaryAppCenter is soon gaining support for Flatpak. Learn what that means, why Flatpak, and how things will be shaping up in the near future. https://blog.elementary.io/elementary-appcenter-flatpak/
Papal Penguin
has fpakman that currently does Flatpak and Snaps, and will be adding app images. I tried elementary os and it was ok but i wasnt impressed with it because of the driver support in