Update regarding Surgeon Simulator, see attached screenshot. Permission to share response granted.
(GOG support has been contacted regarding the missing Soundtrack bits since the devs don't seem to know what's up with that.)

Sorry that I'll have to rain on your parade. But I tested it and it seems as if "Broken Sword" on this official page is in fact referring to "Broken Sword Director's Cut" - same goes for Broken Sword 2.

So in other words. Those packages (*.dat file) are meant for the Director's Cut of the game and not the original ones (which needs *.clv files). Since GOG already have those included, they are useless for GOG customers.

Great, this is what the dev support themselves told us. >_<

Did not know that you asked them. Could have saved some time ... but yeah, seems we are out of luck here - again.

Yeah, we mentioned the classic versions specifically and we were told to use the language files there. Time to contact them again I suppose.

I believe you, don't worry. :P
I own the games on disc. Don't think it includes the originals.

If you own the games on disc I 'd rather persume that you ARE owning the originals. Did they even release the DVs physically?

I recently came across a few games which have a Mac build on Steam but not on GOG. I’m pretty sure there are more, I have not been keeping track but these are just the ones I noted recently. However, most of them are cases where the rights to the Mac build are owned by a different publisher, so I’m not sure if we are including those cases? (I noticed that “XCOM: Enemy Unknown" is already on the list however)

The Bureau: XCOM Declassified

Published by Aspyr (Mac):
Bioshock Remastered
Homeworld Remastered Collection
Mafia III
Sid Meier’s Civilization IV
STAR WARS - The Force Unleashed Ultimate Sith Edition
Star Wars: Jedi Knight - Jedi Academy
Star Wars: Jedi Knight II - Jedi Outcast
STAR WARS Knights of the Old Republic
STAR WARS Knights of the Old Republic II

Published by Feral Interactive:
Hitman: Absolution
LEGO Star Wars - The Complete Saga
Mafia II
Sid Meier’s Railroads!
EDIT: Tropico 4

I wonder if GOG or anyone has contacted Aspyr, they have blooper teams games published here which makes me think there's atleast hope albeit a minor one unlike Feral Interactive, the different builds are also shown on the games themselves so customers already know which version they will buy and are supported for the game.

Second treatment sounds a little like a shitlist tbh even if it's true but in this case it's definately out of the devs/publishers like 2K's hands if MAC/Linux ported games done by Feral etc flatout refuses to put them here. In this case it would better have a thread dedicated to devs and publishers who should be put at a permanent avoid at cost list and pubs/devs like Feral, Wolcen Studio, Capcom etc and many more would fit nicely in there considering how they see GOG users.

Added
Hob
Holy Potatoes! A Spy Story?!
Hot Tin Roof: The Cat That Wore A Fedora
In The Shadows
Interstellaria
Into the Stars
Invisible, Inc.
Jalopy
Kenshi
Knights and Merchants: The Peasants Rebellion
Layers of Fear
LEGRAND LEGACY: Tale of the Fatebounds
Lichdom: Battlemage
Lock's Quest
Lone Survivor: The Director's Cut
Lost Sea
Magicmaker
Maize
Missing paid Soundtrack DLC
Night of the Rabbit
Niko: Through The Dream
Obduction
Octodad: Dadliest Catch
Oddworld: New 'n' Tasty
The Masterplan

(Don't be alarmed, most of these are missing soundtracks. Or be alarmed if you want to.)

Updated:
Hyper Light Drifter
Memoria
Nuclear Throne

Added
Omensight
Paradigm
Pier Solar and the Great Architects
Pixel Piracy
Pixeljunk Shooter
Primordia
Psychonauts
Rain World
Rainswept

Updated
OlliOlli Series (Specifically, OlliOlli2: Welcome to Olliwood)
Pixeljunk Monsters HD
Q.U.B.E.: Director's Cut
Race the Sun


Bit late, but removed that from Broken Sword, then.
Sorry for the false hope, everyone!

There may be a few other games with the same problem:

8-Bit Armies
8-Bit Hordes
8-Bit Invaders!
A Hat in Time
Aragami
Banished
Barony
BUTCHER
Clustertruck
Convoy
Cossacks 3
Craft The World
Darkest Dungeon
Dawn of Man
Dead Cells
DEADBOLT
Deathtrap
Dying Light
Escapist 2
Expeditions: Viking
Galactic Civilizations III
Galaxy of Pen and Paper
Gnomoria
Gratuitous Space Battles 2
Hammerwatch
Hand of Fate 2
Hegemony III: Clash of the Ancients
Hello Neighbor
Heroes of Hammerwatch
Homeworld Remastered Collection
Hotline Miami 2: Wrong Number
Imperator: Rome
Impossible Creatures
Kerbal Space Program
Lords of Xulima
Majesty Gold HD
Master of Orion (2016)
Mount & Blade: Warband
Neverwinter Nights: Enhanced Edition
Nexus: The Jupiter Incident
No Man's Sky
Offworld Trading Company
Overfall
Party Hard
Party Hard 2
Pillars of Eternity 2
Planetbase
Project Highrise
Punch Club
Railway Empire
Saints Row IV
SHENZHEN I/O
SimplePlanes
Slay The Spire
SOMA
Sorcerer King: Rivals
Space Colony (on GOG it is Space Colony HD and on Steam: Steam Edition - Is it the same game?)
Star Control: Origins
Star Ruler 2
STAR WARS Empire at War
STAR WARS Knights of the Old Republic II: The Sith Lords
Starbound
Stronghold Crusader 2
Sudden Strike 4
Surviving Mars
Tangledeep
The Colonists
The Masterplan
This War of Mine
Titan Quest Anniversary Edition
TowerFall Ascension
Tropico 5
Turok
We Happy Few
Windward
X-Morph: Defense

However at least Germans who are missing German language for this or other games can be helped here.

Why the hell is this on here? Actually, what happened to the one-liner reasons for the additions.

Also, is the OP not current anymore? Pretty sure BATTLETECH should still be under Special Mentions unless the "GOG users who pre-ordered require a 3rd-party account in order to use their custom Mech skins, the Steam version doesn't" fits on one of the spreadsheets or was it confirmed fixed by someone understood that they needed to be offline when testing.