Steam - sh.itjust.works

Their engine is called source.

The collection of libraries valve release to use steam (the piping, if you will), is called steamworks.

Would have been cooler if they named their engine Vapor instead
Yeah but then it would be vaporware
Thats the joke
it was 3/4 of a joke at best, it was missing that final umph.
⅔ of a joke, if you will
Instead the story is that the source engine was located in the “Src” directory in their Visual Source Safe. And the Half Life 1 engine was in a separate branch named GoldSrc because it was about to ship real soon, and they needed to keep changes to a minimum.
Also Steam Boxes should have been called Boilers. Maybe then they would have succeeded.
They should make a single home stambox like a console version of the Deck, and call it the Engine
The code name of the first Steam Box, before it was released, was Piston, which fits the theme pretty well. e.g. www.polygon.com/…/piston-valve-steam-box-xi3
Valve partner Xi3's 'Steam Box' codenamed Piston, early specs detailed at CES

Polygon