Apache includes a feather in its logo, and Python is associated with a snake. "Quetzalcoatl" means "feathered snake" and does not appear to be used by any other software project.
Which I can fully understand, because "Quetzalcoatl" is harder to pronounce than the 16 character password for the mainframe that was generated using /dev/random.
I liked "Asphyxia" though. Makes a nice password too. Mike.