There are a total of 6 different packages for Divinity: Original Sin on the GoG store. I'm trying to figure out what the ranking is in order of completeness for my own sanity, and for the edification of future potential interest.

It looks like we have, going from least to most complete:
Divinity: Original Sin - Enhanced Edition (list price: USD $39.99)
Divinity: Original Sin Enhanced Edition Collector's Edition (list price USD $69.99)
Includes Divine Divinity, Beyond Divinity, and Divinity 2: Developer's Cut (aka Ego Draconis, if I am reading my search info correctly), all of which seem to be Windows only
Divinity: Original Sin 2 - Difinitive Editioin (list price USD $44.99)
Divinity: Original Sin 2 - Divine Edition (list price USD $59.99)
Divinity: Original Sin 2 - Eternal Editioin (list price $89.99)
Includes Divine Divinity, Beyond Divinity, and Divinity 2: Developer's Cut (aka Ego Draconis, if I am reading my search info correctly), all of which seem to be Windows only

Those are all pretty straight forward, and mostly include OSTs, lore novellas, hint books, maps, artbooks, etc.

But, where does Divinity: Original Sin - The Source Saga fall as far as the game timeline and game inclusions go? Or is it just the stripped-down, bare bones D:OS and D:OS2 games?

I'm a Mac user, so I expect more than a little bit of being left out in the cold as far as a lot of games go, so I was glad to see that most of the Divinity franchise is available for me, but am I still SOL for the "anthology" of DD, BD, and D2?