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).
Very simple command line application downloader. Simply enter the name of the application or partial. There are no dependancies, install anywhere, and even add to environmental variables for global use. Very small footprint. No installer, so does not mess with registries.