A Universal linux app store. Contribute to AppOutlet/AppOutlet development by creating an account on GitHub.
I noticed the AppOutlet repo has been archived, but I really liked the idea of one store to rule them all (I.e. snaps, appimages, flatpaks, etc. in one place).
I like the integration with Timeshift and the into packed interface with ability to click on details. On the downside, the themes are limited and it's kind of hard to use for browsing apps that you might want to install.