Chocolatey - The sane way to manage software on Windows.
add-apt-key - This command line tool can be used to add a GPG key to your APT key ring.
Homebrew - The missing package manager for macOS
launchpad-getkeys - Launchpad-Getkeys is a script (comes packaged in a .
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.