Flatpak

Flatpak 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.
Flatpak was developed as part of the freedesktop.org project (formerly known as X Desktop Group or XDG) and was originally called xdg-app.
Features.
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.
"Flathub," a repository (or remote source in the Flatpak terminology) located at , has become the de facto standard for getting applications packaged with Flatpak. Packages are added to it by both the Flathub administrators and the developers of the programs themselves (though the admins have stated their preference for developer-submitted apps). Although "Flathub" is the de facto source for applications packaged with Flatpak, Flatpak can work independently of Flathub; it is possible to host a Flatpak repository that is independent of Flathub.
Support.
Theoretically, Flatpak apps can be installed on any existing Linux distribution.
Supported out-of-the-box.
Here is a list of the distributions where Flatpak is installed by default:
Supported.
Here is a list of the distributions where Flatpak is not installed by default but can be installed:
It can also be used on Linux kernel-based systems like Chrome OS.