There are many issues around being able to support snaps or flatpaks. For appimage, it could perhaps work via libertine depending on the app, at least on a very basic level. You likely would need to manually create a .desktop file inside libertine container, to get proper icon and launch the app from the app drawer, though.

@arturo2bodegas That is indeed the goal of most of the things in UTTT. It's like a platform for features that are a bit experimental.

@peter-gamma It would seem so.