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Beyond Compare - Beyond Compare allows you to compare files and folders.
Y PPA Manager - Y PPA Manager is a GUI tool to add, remove, purge, list and search for Launchpad PPAs.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
add-apt-key - This command line tool can be used to add a GPG key to your APT key ring.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Introduce PPA - The program saves you from having to open the console to add a new PPA.