They are making me reconsider P+C and Zeus after I complained that they are both $2.49 and not $1.49 like Caesar. I also have to decide if I want the first two Divinity games on Gog or Steam. Again.
Which
Divinity games?
I do have
Divinity 2: Director's Cut on Steam. I was bored, so I checked the Steam-version out - and actually downloaded it. Granted, you'll have to download it first from Steam, obviously - so you'll need Steam to at least do that much.
But just so you know, that game can be booted from the game-folder w/out Steam running - and it will NOT force the Steam client-program to boot; since it does NOT come equipped w/ Steam's CEG (DRM). No surprise really, given how Larian is often anti-DRM and speaks against it so frequently.
And Div 2: DC Steam-version was saving somewhere locally on my HDD, when I did a save - I just don't know exactly where! Something I should look into.
I can't speak on
Steam-versions of Divine Divinity + Beyond Divinity, though.
I don't know if those come w/ CEG or not - maybe someone else who has them on Steam could actually test it and answer that question? (i.e. close Steam out; go to game folder; run game's EXE; see if Steam client-program boots-up).
I have DD from Retail (before Remastered Ed's came out); and DD Remastered Ed's on GameStop PC Download + GoG.
And I also have BD from Retail + GreenManGaming (it was FREE on GMG once).
EDIT:
The real reason to get any of the
Divinity games on GoG is - you know you'll for sure get them DRM-FREE and also whatever extras + goodies GoG is giving away.
If you feel so inclined - you could add those EXE's as Non-Steam games onto Steam, if you so desire.
(I do this w/ most Non-Steam games, since I live on Steam).
The reason you'd want
Divinity games on Steam is - if the games support any of the typical Steam benefits (game time tracking; Steam Achievements if supported; Steam Cloud support if it supported; etc etc). Worth checking each game's page on Steam, to see what is supported there.
Might be worth checking into, to see which way you think you should go here.