Flatpak

Flatpak, formerly known as xdg-app, is a utility for software deployment and package management for Linux. It is advertised as offering a sandbox environment in which users can run application software in isolation from the rest of the system.

Applications using Flatpak need permissions to have access to resources such as Bluetooth, sound (with PulseAudio), network, and files. These permissions are defined by the maintainer of the Flatpak and can be added or removed by users on their system.

Another key feature of Flatpak is that it allows application developers to directly provide updates to users without going through distributions, and without having to package and test the application separately for each distribution.