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I developed GEM applications on DOS and on the Atari ST, didn't do anything that required as much precision as Ventura Publisher. The runtime that came with Ventura wasn't a standard GEM one.

I know that GEM/4 and GEM/5 has additional features, such as Bézier curve support for Artline.

https://en.wikipedia.org/wiki/GEM_(desktop_environment)

These were eventually backported into FreeGEM and the current OpenGEM has them built in, I believe.

My old and unreliable memory thinks that TOS (the ST DOS) was modeled after DOS as far as interrupt calls and whatnot to make it easier for devs. I know the disk format was the same, though DOS wouldn’t read the ST disk unless it had a DOS boot sector on it. ST didn’t care.

Worth pointing out (see my other comment) that Ventura Publisher was written by the original inventor/architect of GEM itself; Lee Lorenzen. After leaving DR.

I used that for magazine publishing. Definitely better than pasting galleys on boards, which is what it replaced, but I'm not sure I'd go so far as to say I miss it. :)