KAlgebra, KDE's scientific calculator that allows you to plot 2D and 3D functions and let's you work with trigonometric functions and derivatives (among many other things), gets featured in Linux Journal:
Patches for Sony Xperia xa2 to boot with a UART console submitted upstream!
Available here: https://patchwork.kernel.org/project/linux-arm-msm/list/?submitter=176691
#postmarketos dev, mainline all the things, running at ring 0.
We are a cute and loving international community Ｏ(≧▽≦)Ｏ !