PPAs (Personal Package Archives) are personal repositories for various packages built and hosted on Launchpad. As much as PPAs help developers, they help users also. A software is not available in the default repositories? No problem! Add the PPA and install it. Dead simple.
Still, managing PPAs can be sometimes difficult since there is no GUI for it. Well, it is not that difficult to manage PPAs from command line, but still a GUI is always more convenient. This is where Y PPA Manager comes into act. It is a nice little tool by Alin Andrei written in bash. The GUI is done in YAD (a zenity fork), so don’t expect a highly polished and beautiful interface. But the interface is simple enough and quite easy to use. And did I mention that it supports Linux Mint too?