AM is described as 'AUR-inspired database, and package manager to install, update (for real) and manage ALL AppImages and other portable formats for GNU/Linux, system-wide or locally, with the ease of APT and the power of PacMan' and is a Package Manager in the os & utilities category. There are more than 25 alternatives to AM for a variety of platforms, including Linux, Mac, Windows, Ubuntu and Go (Programming Language) apps. The best AM alternative is Chocolatey, which is both free and Open Source. Other great apps like AM are Homebrew, Flatpak, Flathub and Snap Store .
Just a GUI to some package manager