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Chocolatey - The sane way to manage software on Windows.
Y PPA Manager - Y PPA Manager is a GUI tool to add, remove, purge, list and search for Launchpad PPAs.
Homebrew - The missing package manager for macOS
add-apt-key - This command line tool can be used to add a GPG key to your APT key ring.
Ninite - Ninite is the easiest way to install software.
Introduce PPA - The program saves you from having to open the console to add a new PPA.