PackageKit is described as 'A D-Bus abstraction layer that allows the user to manage packages in a secure way using a cross-distro, cross-architecture API' and is a Package Manager in the development category. There are more than 50 alternatives to PackageKit for a variety of platforms, including Linux, Mac, Web-based, Windows and Linux Mobile apps. The best PackageKit alternative is Homebrew, which is both free and Open Source. Other great apps like PackageKit are Synaptic, Bazaar App Store, GNOME Software and pacman (package manager).