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high rated
Sources for those lists:
https://www.gog.com/games?feature=multi&sort=title&page=1
https://pcgamingwiki.com/wiki/
and the respective subforums around here.

Discord for DRM-free multi-player:
https://discord.gg/fs2vyaq

There's actually a terribly outdated old GOGmix about it:
https://www.gog.com/mix/gogs_that_require_galaxy_client_for_multiplayer
Looking through the boards it seems as if prkprkprk has actually left GOG two years ago because of the rise of Galaxy and what obviously came with it.

So lets keep this list up-to-date since it is obviously growing.
Games that need Galaxy for online multi-player and check for unique store accounts before allowing MP:

8-bit Armies + Guardians Campaign
8-bit Hordes
Absolver
Aliens versus Predator Classic 2000
Aragami
Ashes of the Singularity: Escalation + all DLCs
BattleZone 98 Redux + The Red Odyssey
Blood: Fresh Supply
Craft The World + DLCs
Deathtrap
Descent Underground
Double Dragon Trilogy
Dragon's Dogma: Dark Arisen
Dying Light
Gauntlet™ Slayer Edition
Gauntlet™ Slayer Edition - Lilith the Necromancer Pack
Gremlins Inc.
GWENT
Homeworld® Remastered Collection
Homeworld: Deserts of Kharak
Master of Orion 2016
Metal Slug 3
Offworld Trading Company
Rise of the Triad (2013)
Serious Sam's Bogus Detour
Shadow Warrior 2
STAR WARS™ Battlefront™ II (Classic, 2005) - Also has a Galaxy-free multi-player version (classic installer)
Stronghold Crusader 2
THE KING OF FIGHTERS XIII GALAXY EDITION
The King of Fighters '98 Ultimate Match Final Edition (unverified)
The Last Blade
Tooth and Tail
Trine 3: The Artifacts of Power
Vikings-Wolves of Midgard
Witcher Adventure Game, The
Worms W.M.D

---
Games that do not need Galaxy for currently working online multi-player:

AI War: Fleet Command
Age of Wonders III + Eternal Lords + Golden Realms (DRM: needs serial registration and regular authenticity check)
American Conquest + Fight Back (DRM: needs serial registration)
Baldur's Gate
Barony: Cursed Edition
Battle Isle 2
Battle Isle 3
Battle Isle Phase Four: Incubation
Battle Worlds: Kronos (DRM: needs serial registration)
Blood & Gold: Caribbean!
Broforce
Capitalism Plus
Capitalism 2
Celtic Kings: Rage of War
Chaos Reborn (DRM: needs serial registration)
Conflict: Desert Storm
Conquest of the New World
Conquest: Frontier Wars
Daikatana
Darkest Hour: A Hearts of Iron Game
Darkstone
DEFCON (DRM: needs serial registration)
Delta Force
Descent
Descent 2
Descent: Freespace Battle Pack
Diablo Classic (Battle.net)
Die By The Sword + Limb From Limb
Din's Curse + Demon War (DRM: needs serial registration)
Disciples II Gold
Divinity: Original Sin - Enhanced Edition
Divinity: Original Sin 2
DOOM II + Final DOOM
Freespace 2
Grim Dawn
Hammerwatch
Icewind Dale
Incredible Adventures of Van Helsing 1
Jazz Jackrabbit 2 Collection
Neverwinter Nights 2 Complete
Oh...Sir!! The Insult Simulator
Omerta: City of Gangsters + DLCs
Project: Zomboid
Quake 3 Arena
Screencheat
Serious Sam: The First Encounter
Serious Sam: The Second Encounter
Sins of a Solar Empire: Rebellion
Star Wars: Jedi Knight II
Star Wars: Jedi Academy
Starbound
STAR WARS™ Battlefront™ II (Classic, 2005) (classic installer)
Terraria
Theme Hospital
Titan Quest: Anniversary Edition
Unepic
Ultimate DOOM, The
Victor Vran
War for the Overworld
WarCraft II: Battle.net Edition
Windward

---
Games that can be played in multi player mode on a single PC via hotseat, splitscreen etc...

Adventures of Shuggy, The
Ascendant
Aqua Kitty: Milk Mine Defender
Battle Chess Special Edition
Battle Isle
Battle Isle 2
Battle Isle 3
Battle Isle Phase Four: Incubation
BlazBlue: Calamity Trigger
Blood: Fresh Supply
Broforce
Capsized
Chaos Overlords
Chaos Reborn
Crawl
Crimzon Clover
Combat Chess
Conquest of the New World
Cultures: Northland + 8th Wonder of the World (open ports 2302 and 1037)
De Blob
Death Road to Canada
Disciples II Gold
Divinity: Original Sin - Enhanced Edition
Double Dragon Trilogy
Eador: Genesis
Eador: Master of the Broken World
Guacamelee
Heroes of Might and Magic
Heroes of Might and Magic 2: Gold
Heroes of Might and Magic 3: Complete
Heroes of Might and Magic 4: Complete
Heroes of Might and Magic 5: Bundle
Jazz Jackrabbit 2 Collection
Mortal Kombat
Mortal Kombat 2
Mortal Kombat 3
Never Alone: Arctic Collection
Oh...Sir!! The Insult Simulator
PixelJunk Shooter
Serious Sam: The First Encounter
Serious Sam: The Second Encounter
Shovel Knight
Street fighter Alpha 2
THE KING OF FIGHTERS XIII GALAXY EDITION
Towerfall Ascension + The Dark World
Trine Enchanted Edition
Trine 2: Complete Story
Trine 3: The Artifacts of Power
Tyrian 2000
Victor Vran
Vikings-Wolves of Midgard
Warhammer Epic: Final Liberation


Please correct me wherever I'm wrong and mention (preferably tested) games to add to each list.
Post edited 2 days ago by Klumpen0815
high rated
Games with local multiplayer via LAN:

1nsane
Airline Tycoon Deluxe
Age of Wonders
Age of Wonders: Shadow Magic
Age of Wonders 2: The Wizard's Throne
Alien Nations
An Elder Scrolls Legend: Battlespire
Anno 1404: Gold Edition
Anno 1701 A.D.
Apache Longbow
Army Men RTS
Baldur's Gate Complete
Baldur's Gate II Complete
Battle Isle 3
Battle Isle Phase Four: Incubation
Battle Realms + Winter of the Wolf
Barony: Cursed Edition
Blitzkrieg Anthology
Blitzkrieg 2 Anthology
Capitalism 2
Celtic Kings: Rage of War
Chaos Overlords
Codename: Panzers - Phase One
Codename: Panzers - Phase Two
Combat Chess
Conflict: Desert Storm
Conga Master
Conquest of the New World
Conquest: Frontier Wars
Constructor Classic 1997
Cossacks Anthology
Cossacks II Anthology
Cultures: Northland + 8th Wonder of the World
Daikatana
Darkest Hour: A Hearts of Iron Game
Darkstone
DEFCON
Delta Force
Delta Force 2
Delta Force: Land Warrior
Descent: Freespace Battle Pack
Die By The Sword + Limb From Limb
Diablo
Diablo Classic
Din's Curse + Demon War
Disciples II Gold
Divinity: Original Sin - Enhanced Edition
Divinity: Original Sin 2
Dying Light
DOOM II + Final DOOM
Dungeon Keeper Gold
Dungeon Keeper 2
Dungeons & Dragons: Dragonshard
Empire Earth Gold Edition
Empire Earth 2 Gold Edition
Freespace 2
Giants: Citizen Kabuto
Grim Dawn
Hammerwatch
Heroes of Might and Magic
Heroes of Might and Magic 2: Gold
Heroes of Might and Magic 3: Complete
Heroes of Might and Magic 4: Complete
Heroes of Might and Magic 5: Bundle
Icewind Dale
Icewind Dale 2 Complete
Incredible Adventures of Van Helsing 1
Lords of the Realm: Royal Edition
Neverwinter Nights 2 Complete
Master of Orion 2
Magic Carpet Plus
Mortal Kombat 3
Nox
Populous
Populous 2: Trials of the Olympian Gods
Populous: The Beginning
Project: Zomboid
Quake
Quake 2
Quake 3 Arena
Sacrifice
Screencheat
Serious Sam: The First Encounter
Serious Sam: The Second Encounter
Settlers 2: 10th Anniversary, The
Settlers 3: Ultimate Collection
Settlers 4: Gold Edition, The
Sid Meier's Alpha Centauri™ Planetary Pack
S.T.A.L.K.E.R.: Shadow of Chernobyl
S.T.A.L.K.E.R.: Call of Pripyat
S.T.A.L.K.E.R.: Clear Sky
Star Wars: Battlefront II
Star Wars Episode 1: Racer
Star Wars: Jedi Knight: Dark Forces II
Star Wars: Jedi Knight II
Star Wars: Jedi Academy
Star Wars: Rebellion
Star Wars: X-Wing vs. TIE Fighter
Star Wars: Empire at War: Gold Pack
Stronghold HD
Stronghold Crusader HD
Syndicate Wars
Terraria
Titan Quest: Anniversary Edition
Total Annihilation: Commander Pack
Total Annihilation: Kingdoms + Iron Plague
Two Worlds Epic Edition
Unepic
Unreal Gold
Unreal Tournament
Unreal Tournament 2004
Ultimate DOOM, The
Vikings-Wolves of Midgard
War for the Overworld
WarCraft II: Battle.net Edition
WarCraft II: Enhanced
Wing Commander: Armada
Windward


(tbc)
Post edited May 02, 2019 by Klumpen0815
Grim Dawn has a LAN option in the multiplayer settings, though I've never tried it.
Some games that have offline multiplayer with a single computer, no Galaxy or network connection required:
Guacamelee
Crimzon Clover
Shovel Knight (with most recent update)
Tyrian 2000 (IIRC)
avatar
ashwald: Grim Dawn has a LAN option in the multiplayer settings, though I've never tried it.
avatar
dtgreene: Some games that have offline multiplayer with a single computer, no Galaxy or network connection required:
Guacamelee
Crimzon Clover
Shovel Knight (with most recent update)
Tyrian 2000 (IIRC)
Thanks to both.
I've thought about a list with single computer multiplayer and will add it since you already started it.

Does anyone know whether the multiplayer mode of "Anomaly 2" and for "8-bit Invaders" works without Galaxy?
It's not stated on the game card but that doesn't mean much.
Post edited May 27, 2017 by Klumpen0815
Offworld Trading Company requires Galaxy for multiplayer
avatar
Ghorpm: Offworld Trading Company requires Galaxy for multiplayer
Thanks, added.

Also added "Ashes of the Singularity: Escalation + all DLCs".
The list is getting longer...

Also:
What did become of the Galaxy plans for Aragami?
Is it still possible to play it online without Galaxy?
http://www.gog.com/forum/aragami/multiplayer/post3
Post edited May 27, 2017 by Klumpen0815
Broforce
Victor Vran

Both offer local co-op on the same computer. Unfortunately for the online multiplayer both rely on servers run by the devs and don't support multplayer via LAN.
avatar
DoctorGOGgles: Broforce
Victor Vran

Both offer local co-op on the same computer. Unfortunately for the online multiplayer both rely on servers run by the devs and don't support multplayer via LAN.
Thanks, added.

Also added "BattleZone 98 Redux + The Red Odyssey" to the mandatory Galaxy list
and a few more to the others.

I'm also through page one from here now.
It would be nice if someone else would go through page 2, etc... and check the store pages, the subforums and probably also
https://pcgamingwiki.com/wiki which also shows multiplayer types also split between local and local via LAN.
Maybe we could make that a community effort (in the hopes of at least some remnants of the old community being around at all).
Since I get region blocked, some don't show for me anyway.
Post edited May 27, 2017 by Klumpen0815
Online multiplayer of Omerta works fine without Galaxy.
Post edited May 27, 2017 by PaterAlf
Oh...Sir!! The Insult Simulator offers both a local hotseat vs mode and an online vs mode without the need for Galaxy. Or at least the Linux version does.
Props for your work, +1
avatar
ashwald: Grim Dawn has a LAN option in the multiplayer settings, though I've never tried it.
works better than the online mp, tbh :)
and as you can guess, LAN = online with little effort

also iirc windward does have both online mp and LAN modes and last time/patch i checked, it seemed to rely on decent TCP/IP networking without any particular additional need or condition, but i could be wrong

PS: i guess than in a mere year, this forum will see a thread like "Games that works DRM free on GOG" btw :)
Post edited May 27, 2017 by Djaron
You can earn some rep by telling me about the multi-player modes of Blitzkrieg 3:
https://www.gog.com/forum/blitzkrieg_series/blitzkrieg_3_multiplayer_lan_support_galaxy_dependent_online_multiplayer

Blood & Gold: Caribbean!
https://www.gog.com/forum/blood_gold_caribbean/blood_gold_caribbean_multiplayer_lan_support_galaxy_dependent_online_multiplayer

Conga Master:
https://www.gog.com/forum/conga_master/conga_master_multiplayer_local_lan_support_galaxy_dependent_online_multiplayer

8-bit Invaders:
https://www.gog.com/forum/8bit_invaders/is_multiplayer_galaxy_exclusive

Anomaly 2 (I forgot to mark the question box here, sorry)
https://www.gog.com/forum/anomaly_series/multiplayer_ipbased_lansupport_devs_servers_galaxy_mandatory

Cultures 1+2:
https://www.gog.com/forum/cultures_series/cultures_12_multiplayer_lan_support_galaxy_independent_online_multiplayer

Cultures (3): Northland + 8th Wonder of the World
https://www.gog.com/forum/cultures_series/cultures_3_multiplayer_lan_support_galaxy_independent_online_multiplayer

Deadlock 1+2
https://www.gog.com/forum/deadlock_series/deadlock_12_multiplayer_lan_support_galaxy_independent_online_multiplayer

Delta Force Series
https://www.gog.com/forum/delta_force_series/delta_force_series_multiplayer_lan_support_galaxy_independent_online_multiplayer

The game-cards could really include such information...
Post edited May 28, 2017 by Klumpen0815
Finished going through page 1+2 here:
https://www.gog.com/games?feature=multi&sort=title&page=1

Hopefully the information I found on each game in the subforums and pcgamingwiki was correct.
May have missed some region blocked games as always (no idea).

I won't have time to do page three in the next week due to work and other things, maybe someone has.
Post edited May 28, 2017 by Klumpen0815