I'm not sure how many hours this will remain available, but Microids is giving away Syberia 1 & 2 on Steam.

It ends today at 2:00 PM but I have no idea what time zone they're using.

Kings and Queens Bundle   (Fanatical)
 
 
Tier 1 :  $1  ($1.25 CAD)

Zen Chess: Champion's Moves
Zen Chess: Mate in One
Zen Chess: Mate in Two
Zen Chess: Mate in Three
Zen Chess: Mate in Four
 
 
Tier 2 :  $2.49  ($3.15 CAD)

Hang The Kings
Knight's Retreat
Knight Swap
Unlock The King
Unlock The King 2
Unlock The King 3
 
 
Tier 3 :  $4.99  ($6.35 CAD)

Chess Knights: High Noon
Knight Swap 2
Ragnarok Chess
Samurai Chess
Wild Wild Chess
Zen Chess: Blindfold Masters

Fanatical Build Your Own Very Positive Bundle

Select 1 game for €0.99, 5 games for €3.05, or 10 games for €5.09 from the list below:

AVICII Invector
Deployment
DISTRAINT 2
Do Not Feed the Monkeys
F1 2018
Help Will Come Tomorrow
Hob
Ittle Dew
Ittle Dew 2+
Joint Task Force
Luxuria Superbia
Monstrum
Nexus - The Jupiter Incident
Press X to Not Die
Project Highrise
Railway Empire
Rebel Galaxy
Reventure
Strikey Sisters
Thunder Wolves

Total FlatOut Bundle   (Indiegala)

Currently $7.49  ($9.69 CAD)  —  12 hours left before the price increases.

FlatOut
FlatOut: Ultimate Carnage
FlatOut 2
FlatOut 3: Chaos & Destruction
FlatOut 4: Total Insanity + Soundtrack
 

Grand Finale Bundle   (Fanatical)

$3.99  ($4.99 CAD)

Automachef
Gone Home + Soundtrack
Leisure Suit Larry: Wet Dreams Don't Dry
Oddworld: New 'n' Tasty
Rogue Heroes: Ruins of Tasos
S.W.I.N.E. - HD Remaster
VVVVVV

Prime Gaming - October (Amazon)

Games are hosted by Amazon and need to be downloaded with their launcher unless noted otherwise.

Games hosted by Amazon tend to be DRM free, but may need manual confirmation. They're also only for Windows or, at most, can be emulated.

Price: varies by region

STAR WARS: Squadrons (activates on Origin)
Ghostrunner (activates on GOG)
Alien: Isolation (activates on Epic Games)
Whiskey & Zombies: Great Southern Zombie Escape
Wallace & Gromit: The Bogey Man
Wallace & Gromit: Muzzled!
Secret Files 3
Song of Horror Complete Edition
Tiny Robots Recharged
Blue Fire
Wallace & Gromit: The Last Resort
Red Wings: Aces of the Sky
Wallace & Gromit: Fright of the Bumblebees

Alien Isolation may be regionally restricted; I'm not seeing it in the UK (not that it matters as I got it for free from Epic ages ago)

Thanks for the heads up!

And now it's appeared in the UK. I reckon it was an accidental omission.

I have no idea what it says internationally, but on the German Amazon page, for Alien Isolation they use a wording like "the full/complete game", and that lead me to believe that it would include all DLCs or something, but it's really just the base game, the same one that Epic already gave away for free ("full/complete" as opposed to demo/shareware version or whatever, I guess, which is a weird use of the words in this time and age with hardly any demos and shareware versions to begin with; and Alien Isolation is no episodic game either).

Also of note: The games on GOG and Origin are given via redeemable copy/paste keys, but for Alien Isolation on Epic, you actually have to connect your Amazon account to your Epic account.

"30% OFF" game bundle (Itchio)

NES homebrew bundle. You get ROMs with it.

$3.49

Mr. Maymunshine's Christmas Land
Weed N' Stiff 2 - Bobson’s Revenge

Remute's Amiga Love Bundle (Groupers)

Bundle of 4 Commodore Amiga games and 1 audio file. Top contributor also gets a video in both usual format and as a SNES ROM.

$6.66 - Preorder price

Contents not revealed during preorder period.
Preorder ends on Oct. 5, 5 PM UTC.

Update 1: Bundle creator says these games will be delivered as Itchio activation keys.

Platinum Collection : Build your own Bundle  (October 2021)    (Fanatical)
 
 
3 for $9.99 ($12.59 CAD)   ⁞   5 for $14.99 ($18.99 CAD)   ⁞   7 for $19.99 ($24.99 CAD)
 
 
As Far As The Eye
Battlefleet Gothic: Armada
Bridge Constructor: The Walking Dead
Curious Expedition
DARQ - Complete Edition
Liberated
Neversong
Niche: A Genetics Survival Game
Nimbatus: The Space Drone Constructor
Panzer Corps - Gold Edition
Road Redemption
Secret Government
Space Hulk: Deathwing - Enhanced Edition
Streets of Rogue
Tangledeep
This Is the Police 2
Toxikk - Full Game
Trine 4: The Nightmare Prince
Warhammer 40,000: Space Wolf - Special Edition   ( Base game + 4 DLCs )
Warpips

 
Build your own Fall Bundle   (Fanatical)
 
 
1 for $1 ($1.25 CAD)   ⁞   5 for $2.99 ($3.79 CAD)   ⁞   10 for $4.99 ($6.29 CAD)
 
 
Airline Tycoon Deluxe
Bot Vice
Codex of Victory
Conglomerate 451
Cyber Hook
Diorama Builder
Dumpy & Bumpy
Flying Tigers: Shadows Over China
Haimrik
Hidden Shapes Black Skull: Jigsaw Puzzle Game
Jelly Brawl
Love
Love 2: Kuso
Papo & Yo
Realpolitiks
Re-Legion
Super Star Path
The Little Acre
Tinker Racers
World of Zoo
 
 
∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙
 
 
Battlefield Bundle   (Steam)

$10.92  ($14.75 CAD)

Battlefield 1 - Revolution Edition   ( Base game + 7 expansion packs )
Battlefield 4 - Premium Edition   ( Base game + 5 expansion packs + 12 bonus Battlepacks )
Battlefield V - Definitive Edition   ( Base game + all gameplay content )

Note :  The Origin client is required for all three games.

Play Pink : The Best of Asmodee Digital   (Humble)
 
 
$1 or more  ($1.27 CAD)

Love Letter
Pandemic: The Board Game
Pandemic - On the Brink: Roles & Events  (DLC)
Small World
Small World: Cursed  (DLC)
 
 
Beat the average

A Game of Thrones: The Board Game – Digital Edition
Arkham Horror: Mother's Embrace
Blood Rage – Digital Edition
Pandemic - On the Brink: Mutation  (DLC)
Scythe – Digital Edition
Terraforming Mars
The Lord of the Rings: Adventure Card Game – Definitive Edition
Ticket to Ride: Europe  (DLC)
Ticket to Ride: France  (DLC)
Ticket to Ride: Legendary Asia  (DLC)
 
 
$12 or more  ($15.28 CAD)

Carcassonne: Tiles & Tactics
Small World: A Spider's Web  (DLC)
Small World: Royal Bonus  (DLC)
Splendor
Ticket to Ride
Ticket to Ride: Nordic Countries  (DLC)
Ticket to Ride: United Kingdom  (DLC)
Ticket to Ride: USA 1910  (DLC)