The most important productivity app you didn't know you were missing.
It allows the KDE e.v. board from 2007-2008 to watch you work and silently judge you. See if Aaron Seigo's slight frown doesn't guilt you into coding a million times better.
Install Python. Run pip install KEyes. Run keyes. That's it.
Face pictures are from the KDE e.V. web site and some sort of copyright certainly applies. KEyes is licensed under the GPL3 so if you want to make it even better somehow, you can.