Souk is described as 'flatpak-based app store, written with GTK4 and Rust'. There are more than 25 alternatives to Souk for a variety of platforms, including Linux, Online / Web-based, Android, Android Tablet and Windows. The best alternative is F-Droid, which is both free and Open Source. Other great apps like Souk are Aurora Store (Free, Open Source), Chocolatey (Freemium, Open Source), Google Play Store (Free) and Homebrew (Free, Open Source).
Aurora Store is an unofficial, FOSS client to Google's Play Store with an elegant design. Not only does Aurora Store download, update, and search for apps like the Play Store, it also empowers the user with new features.
Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+. * Install, remove, upgrade and downgrade single and multiple packages. * Upgrade your whole system.
Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system. In Aptoide, unlike the default Google Play Store, there is not a unique and centralized store but each user manages their own store.
In an effort to make things easy, and maybe even fun, AndroidPolice.com created APK Mirror. Over the past several months, they've been working to build a smooth, reliable, trust-worthy site to host the downloads users love. You also can upload APKs to the site yourself.