Even more GOG connect added!

Free with purchase, Gods will be watching, with a preorder of the Red Strings Club

New free game! Carmageddon TDR 2000! For another 36 hours! Go go go!

I'm slightly off-topic, but somewhere is there a list with all the pre-order bonuses offered "free" on GOG?
Although I don't like the practice, I think it's useful to get an idea of the completeness of the games here.

Could you quote an example?

Currently I've already included pre-order freebies
Temporary Free Games - Pre-order Freebies

I mean DLC pre-order bonuses such as those of Kingdom Come: Deliverance or Pillars of Eternity II, so I'm not sure that you may be interested in classifying them.

They may seem little things, but for a completist like me they can make a difference, and they are usually no longer put up for sale, except for the most successful games when the "complete edition" comes out.

The only issue with this is that it will not show up as an entry on GOGMix, but that's a minor matter.

But I guess we could do this here as well, I'll create a post for this. Probably going to need everyone's help on this since I have not kept track of all these pre-order freebies

Oh great, thank you for your help! I'll try to link to you all those I know.

Edit: In addition to the two already mentioned I have found these:

We Happy Few offer "exclusive in-game Jolly Brolly weapon"
Seven: The Days Long Gone offered the "Shadowhand Armor DLC"
Hellmut: The Badass from Hell offer the "Soundtrack and Wallpapers"
Railway Empire offered "free OST and an exclusive locomotive skin"

-------------------------------
List of Temporary Free Games - Pre-order DLC and Misc Freebies
-------------------------------

PILLARS OF ETERNITY II
Alexim says: The Captain's Footlocker DLC

HELLMUT: THE BADASS FROM HELL
Alexim says: Free soundtrack and wallpaper

KINGDOM COME: DELIVERANCE
Alexim says: Treasures of the Past DLC

RAILWAY EMPIRE
Alexim says: Free OST and exclusive Locomotive Skin

SEVEN: THE DAYS LONG GONE
Alexim says: Shadowhand Armor DLC

WE HAPPY FEW
Alexim says: Exclusive in-game Jolly Brolly Weapon

FULL THROTTLE REMASTERED
Alexim says: 4 wall papers

ROGUE TROOPER REDUX
Alexim says: Free Collector's Edition Upgrade DLC

TREASURE ADVENTURE WORLD
Alexim says: Digital instruction booklet and soundtrack

ANCESTORS : LEGACY
Startrail says: Digital art book and soundtrack

DUNGEONS 3
Alexim says: Excllusive Horde Throne Room DLC and OST

BATTLETECH
Alexim says: Free Shadowhawk Pack DLC plus an exclusive war paper

THE LEGEND OF HEROES: TRAILS OF COLD STEEL II
Alexim says: With purchase of any of the three Trails in the Sky games, a free code for Trails in the Sky Costumes DLC will be provided.

SURVIVING MARS
Startrail says: OST and an exclusive set of in-game dome styles inspired by Paradox's Stellaris

BANNER SAGA 3
Startrail says: Dredge Ally Pack, an extra character DLC given free with pre-purchase

SHADOWS: AWAKENING
Startrail says: Digital artbook and soundtrack

DARKSIDERS III
Startrail says: Exclusive armor set

DEATH'S GAMBIT
Startrail says: Chosen of Death Patch which includes a scythe, a shield and a kickass mount

PATHFINDER: KINGMAKER
Startrail says: Expert's Hat, the Mesmerizing Necklace, and an Owlcat Pet

PHANTOM DOCTRINE
Startrail says: Buy before August 28 2018 and get artbook and soundtrack free

X4: FOUNDATIONS
Startrail says: Exclusive paint mod

IMPERATOR: ROME
Startrail says: Epirus Flavor Pack, contains cosmetic items, 6 event chains and a new music track

AGE OF WONDERS: PLANETFALL
Startrail says: Paragon Noble Cosmetic Pack

WEEDCRAFT INC.
Startrail says: Austin High movie with every pre-order

WARLOCKS 2: GOD SLAYERS
Startrail says: Soundtrack for all pre-orders before 18th July 2019

CYBERPUNK 2077
Startrail says: 30% discount off CD PROJEKT RED Merchandise Store for pre-orders before 17th June 2019

JUDGEMENT:APOCALYPSE SURVIVAL SIMULATION
Startraill says: Free soundtrack for all purchases before 20th June 2019

CHILDREN OF MORTA
Startrail says: Free soundtrack for pre-orders till release (Tentatively 31st December 2019)

METAL WOLF CHAOS XD
Startrail says: Free skin DLC with preorder till the 6th of August 2019

WARTILE
Startrail says: Free soundtrack for all purchases before 8th August 2019

YOOKA-LAYLEE AND THE IMPOSSIBLE LAIR
Startrail says: Free DLC, Trowzer's Top Tonic Pack, for purchases before October 8th 2019

PATHOLOGIC: MARBLE NEST
Startrail says: Free for existing owners of Pathologic 2 or people who purchase the base game before DLC release

MOSAIC
Startrail says: Free Mosaic OST and 1% DLC for pre-order of Mosaic before the 5th of December 2019

WASTELAND3
Startrail says: Free Colorada Survival Gear DLC for pre-order of Wasteland 3 before the 19th of May 2020

GREEDFALL
Startrail says: Adventurer’s Gear DLC free with purchases from the 11th to 13th of December 2019

MORDHEIM
Startrail says: Free HIRED SWORDS DLC BUNDLE 2 - Doomweaver + Wolf-Priest of Ulric with every purchase as apology for lack of online features.

WITCHER GOODIES
Startrail says: Part of Spring Sale 2020 from 17th to 19th March 2020
Startrail says: Given away from the 17th till 20th of May 2021 as Part of Witcher 2 and 3 Anniversary
Startrail says: Free from the 16th of December till the 5th of January 2022 as part of Winter Sale 2021
Startrail says: Given away from the 17 till 22 of May 2022 as Part of Witcher 3 Wild Hunt Anniversary

SPRING GOODIES #1
Startrail says: Part of Spring Sale 2020 from 24th to 26th March 2020

SPRING GOODIES #2
Startrail says: Part of Spring Sale 2020 from 27th to 29th March 2020

OVERCOOKED2
kbnrylaec says: Surf 'n' Turf DLC and Too Many Cooks Pack DLC given free to celebrate the Gourmet edition release, from the 15th to 20th of April 2020

DESPERADOS 3
Startrail says: Purchase the Deluxe edition at the price of the Standard. Comes with soundtrack and Season Pass until 16th June 2020

DESTROY ALL HUMANS
Startrail says: Free additional 5 skins until 28th July 2020

NEON ABYSS
Startrail says: Free Lovable Rogues Pack DLC from 14th till 22nd July 2020 as part of Launch Edition.
JackknifeJohsnon says: Alter GO DLC Free from 1st till 8th of April 2021

EVER FORWARD
Startrail says: Free Additional Puzzle DLC and Soundtrack with purchase of Special Launch Edition from 26th to 30th of August 2020

GHOSTRUNNER
Startrail says: Free in-game Katana sword if purchased from 19th to 27th October 2020

BATTLESTAR GALACTICA DEADLOCK:ARMISTICE
Startrail says: Free Modern Ships Pack if purchased before 1st October 2020

OBSERVER: SYSTEM REDUX
Startrail says: Free upgrade for preorders of Observer: System Redux to Deluxe Edition which includes Digital Soundtrack and Artbook from 4th to 10th November 2020

XIII
Startrail says: Free Classic Weapons Skin Pack for pre-orders from 7th to 10th November 2020

KINGDOM COME DELIVERANCE
Startrail says: Free Making Of DLC for News Letter Subscribers from 6th to 7th February 2021

THE AMAZING AMERICAN CIRCUS
Startrail says: Free upgrade to the Ringmaster's Edition which includes OST and Ringmaster's Essentials DLC from the 20th of May 2021 till the 12th of August 2021

WARHAMMER SKULLS DIGITAL GOODIE PACK
Startrail says: Free from 4 - 10 June 2021

MORTAL SHELL
Startrail says: Free Mortal Shell - the Virtuous Cycle from the 18th to 23rd of August 2021 as part of the release celebration of Mortal Shell.

HEXTECH MAYHEM
Startrail says: Free Ruined Ziggs Skin from the 9th to 16th November 2021 with pre-order of Hextech Mayhem

SHADOW WARRIOR 3
Startrail says: Free Koromodako Katana DLC with pre-purchase of Shadow Warrior 3 from the 1st of Februray 2022 to the 1st of March 2022

OLD WORLD
Startrail says: Free Old World - Heroes of Aegean DLC from 19 May 2022 till 02 June 2022 with every purchase of Old World.

WARHAMER SKULLS 2022 DIGITAL GOODIE PACK
Lexor says : Free
MartinRossi says: Free from 1 to 8 June 2022

DESTROY ALL HUMANS 2 REPROBE
Startrail says: Free Destroy all Humans Clone Carnage from 02 June 2022 till 30 August 2022

WAY OF THE HUNTER
Startrail says : Free Hunter's Pack from the 22 June 2022 till 16 August 2022

A PLAGUE TALE: REQUIEM
Startrail says: Free Protector Pack from 23rd June 2022 till 18 October 2022

S.T.A.L.K.E.R 2
Startrail says: Free Extended Campfire Content and Early Bird Skins from 6 July till release (Currently 31 Dec 2023 - rbstego)

CDPR GOODIE PACK
Startrail says: Free from 8 till 11 August 2022 as part of CDPR 20th Anniversary Celebrations
Startrail says: Free from 14 till 18 December 2022 as part of Winter Sale 2022
Startrail says: Free from the 28th to 30th of January 2023 as part of New Year Sale 2023

VIDEO GAME HISTORY FOUNDATION GOODIE PACK
Startrail says: Free from 6 till 9 October 2022

A PLAGUE TALE DIGITAL GOODIES
Startrail says: Free from 17 till 20 October 2022

KNIGHTS OF HONOR2
Startrail says: Free Digital Goodie Pack from 6 till 9th December 2022

SPONGEBOB SQUAREPANTS: THE COSMIC SHAKE
Startrail says: Official Costume Pack DLC Free from 6 December 2022 till 31 January 2023

NORCO GOODIES PACK
Startrail says: Free from 23 to 29 December 2022 as part of Winter Sale 2022

]CHUCHEL AND BOTANICULAR GOODIE PACK
Startrail says: Free from the 13th to 15th of Feburary 2023 as part of We Love Games Sale 2023

INKULINATI GOODIES PACK
Startrail says: Free from the 15th till 17th of Feburary 2023 as part of Medieval Games Sale 2023

SHERLOCK HOLMES THE AWAKENED
Startrail says: Free Pre-Launch Exclusive DLC - The Sleuth's Attire from 6th March 2023 till 11 April 2023

THE MAGESEEKER -- A LEAGUE OF LEGENDS STORY
Alexim says: Everyone who pre-order both standard or deluxe edition will receive exclusive Lost Silverwing

DREDGE
Alexim says: Receive Custom Fishing Rod in-game Item, up till 30th March 2023

EUROPA UNIVERSALIS IV: DOMINION
solar_dome says: Everyone who pre-orders Domination will receive a dedicated Music Pack in the form of Europa Universalis IV: March of Power Music Pack"

AGE OF WONDERS 4
Startrail says: Preorder will get DLC in the form of additional ruler and an armor set from the 3rd of April 2023 till the 2nd of May 2023

STRAYED LIGHTS
Startrail says: Free soundtrack and digial artbook from the 6th till 25th of April 2023

LORD OF THE RINGS: GOLLUM
Startrail says: Preorder will get Emotes Pack DLC from the 9th till 25th of May 2023

CONVERGENCE
Startrail says: Preorder will get the Golden Ekko Skin from the 10th till 2nd of May 2023

WARHAMMER SKULLS 2023 DIGITAL GOODIE PACK
Erbello says: Free as part of Skulls Wekk 2023 from the 25th till 28th of May 2023

SYSTEM SHOCK GOODIE PACK
goldfishfingers says: Free from the 30th of May 2023 till the 1st of June 2023

STASIS: BONE TOTEM
solar_dome says: Free Supporters Pack with every purchase of Stasis: Bone Totem from the 1st till 14th of June 2023.

CYBERPUINK 2027 & PHANTOM LIBERTY GOODIES COLLECTION
_Auster_ says: Free from the 12th till 14th of June 2023
Startrail says: Free from the 14th till 21st of September 2023

CHERNOBYLITE
Startrail says: Free Deadly Frost Pack DLC with every purchase from 12th till 14th June 2023.

EVERDREAM VALLEY GOODIES
Startrail says: Free from the 15th till 18th of June 2023 as part of Summer Sale 2023

FROSTPUINK
Startrail says: Free Last Autumn DLC with every purchase from the 21st till 23rd of June 2023

GYLT
Startrail says: Free OST from the 27th of July 2023 till the 2nd of August 2023

GORD
Startrail says: Receive Deluxe Edition from the 28th of July 2023 till the 17th of August 2023

BALDUR'S GATE GOODIE PACK
Startrail says: Free from the 1st till 4th of August 2023

SONG OF NUNU
Startrail says: Preorder from the 14th of September 2023 till the 1st of November 2023 will receive an Art Book

LEGEND OF NAYUTA
Startrail says: Free OST from the 19th till 26th of September 2023

RAWCEMBER GOODIE PACK
Startrail says: Free from the 1st till 13th of December 2023

WARHAMMER 40,000: ROGUE TRADER
L-O_1 says: Free DLC to owners, by 31st January 2024

BANDLE TALE: A LEAGUE OF LEGENDS STORY
Startrail says: Free Bandle Scout Hat Bonus from the 18th of January 2024 till the 21st of Feburary 2024

NOMADS OF DRIFTLAND
SCPM says: Free The Forgotten Passage from the 29th of February till the 6th of March 2024

WARHAMMER SKULLS 2024 DIGITAL GOODIE PACK
Startrail says: Free from the 23rd till 30th of May 2024

CONSCRIPT
Startrail says: Free Golden Gun Pack, till the 12th of June 2024

WEREWOLF: THE APOCALYPSE - PRUGATORY
L-O_1 says: Free wallpapers and OST Tracks

Time-limit:
Buy The Fall Part 2 to get The Fall

Other Pre-order DLC and Misc Freebies:

Full Throttle Remastered offered 4 wallpapers
Rogue Trooper Redux offered The Collector’s Edition upgrade for free, that includes: The original 21 track Rogue trooper soundtrack; An exclusive Rogue trooper comic; 2 sets of HD desktop wallpapers. It's now possible buy it separately.
Treasure Adventure World offered a digital Instruction Booklet and the soundtrack (MP3 and FLAC). It's now possible buy it separately.

Thanks for this! :) Didn't see this
Great! Thanks!

Hellmut: The Badass from Hell now offer also an exclusive weapon: the GOG Galaxificator. Seems to be an exclusive of GOG.

In addition, here are the links to sources for the bonuses of yesterday that for some reason I couldn't post:
Full Throttle Remastered offered 4 wallpapers
Rogue Trooper Redux offered The Collector’s Edition upgrade for free, that includes: The original 21 track Rogue trooper soundtrack; An exclusive Rogue trooper comic; 2 sets of HD desktop wallpapers. It's now possible buy it separately.
Treasure Adventure World offered a digital Instruction Booklet and the soundtrack (MP3 and FLAC). It's now possible buy it separately.

Edit:
Dungeons 3 offered the exclusive Horde Throne Room DLC and the game's OST (MP3 and FLAC).

Not a real pre-order bonus, but with The Legend of Heroes: Trails of Cold Steel II "If you own any of the three Trails in the Sky games, you will receive a free code for the Trails in the Sky Costumes DLC, which you can redeem in Trails of Cold Steel II. Look for the code in your library."

Dungeons 2 free for the next couple days!