Snap Store - An in-app shopping experience from Snapchat 🐶🔥
FLATHUB - Apps for Linux, right here
GNOME Software - A application for installing apps and updates.
AppImageHub - AppImage applications for Linux without installation
bauh - bauh (ba-oo), formerly known as fpakman, is a graphical interface for managing your Linux software (packages/applications). It currently supports the following formats: AppImage, ArchLinux repositories/AUR, Flatpak, Snap and Web applications.
Flatpak - Flatpak is the new framework for desktop applications on Linux