A D-Bus abstraction layer that allows the user to manage packages in a secure way using a cross-distro, cross-architecture API.
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Flattool Alternatives
Flattool is described as 'Command line script designed to improve user experience with flatpaks. It streamlines flatpak management tasks, making them more efficient and user-friendly' and is a Package Manager in the development category. There are more than 50 alternatives to Flattool for a variety of platforms, including Linux, Mac, Windows, Flathub and Flatpak apps. The best Flattool alternative is UniGetUI, which is both free and Open Source. Other great apps like Flattool are Chocolatey, Ninite, MacUpdater and Homebrew.