Armin - creator of Flask https://en.wikipedia.org/wiki/Armin_Ronacher

Mario - creator of Pi https://pi.dev

Mario Zechner aka badlogic - (co?)creator of libGDX (for us old farts who were around in the early Android days): https://libgdx.com/

Later also heavily involved with Spine, which IME is still the defacto industry standard for 2D skinned animation in mobile/web games: https://esotericsoftware.com/