Y PPA Manager - Y PPA Manager is a GUI tool to add, remove, purge, list and search for Launchpad PPAs.
add-apt-key - This command line tool can be used to add a GPG key to your APT key ring.
Yarn - Yarn is a package manager for your code.
Beyond Compare - Beyond Compare allows you to compare files and folders.
GNOME Terminal - GNOME Terminal is a terminal emulator for GNOME desktop.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.