In my home-brew, I made Bytopia (or at least half of it) the plane of creativity and invention. I'm not trying to push this as standard, I just need some help.
Because of my mythic bias (being more familiar with Greco-Roman than other pantheons), I can't think of a lot of gods or mortals that would populate this plane.
Please note, I'm not looking for gods of knowledge (as I put them elsewhere), I'm looking for mythic beings famous for their engineering and creative constructions
So far, all I can think of are:
-Hephaetus/Vulcan - blacksmith god of the Greeks
-Daedelus - designer of the Labyrinth and wings to fly
-Volund or Weylund - the dwarf/dark elf smith in Norse myth (also a maimed blacksmith and an inventor of flying wings)
-Ptah of the Egyptian pantheon
-Goibniu/Lucta/Credne of Celtic myth
-Gond
-Da Vinci - not a myth but so impressive that he's almost mythic
-Tesla - similar to the Da Vinci cult
I'm also looking for famous fantasic inventions from myth, for example:
-Talos - a giant metal robot built by Hespatus to protect Crete. It would walk the circumference of the island three times a day watching for intruders
So what else should I add?
Some of Archimedes' legendary inventions wouldn't have worked in real life, but might be just fine for a fantasy world:
* The huge concave mirror to burn up approaching ships with concentrated sunlight.
* Crossbows and catapults that defended Syracuse from beseiging Roman invaders, so accurate and powerful that the Roman army had to camp over a mile away to avoid casualties.
* Giant iron claws, weighted down underneath the waves of the harbor, that when released by pulleys could tilt up and overturn incoming ships in a single thrust.
* A block and tackle so powerful and well-geared that a single man could, albeit very slowly, haul a laden cargo ship up out of the harbor and onto the beach.