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‘whatshell’ script comes from ~mascheck: the rest shown are mine. Wallpaper (although not really visible) comes from the OS-Tan Collections' gallery, and is Inu-T.
The editor on the left is Vim with an execlineb(1) plugin added. I actually use it to start my X session.
Additional screenshot, just because:
Notes: I switched urxvt for Alacritty since it let me use bitmap fonts. Also, images in the screenshot are from Unsplash: go check those people out: Agnieszka Stankiewicz (desert), and Elisa Kerschbaumer (beach).