This page breaks down the Call of Duty series DLC in great detail. Unfortunately, they do not all have images.
https://callofduty.fandom.com/wiki/Downloadable_Content

I'll break down a few right now, going from the bottom up.
Again, if anyone sees I'm incorrect about something, let me know, since I am just going off that site and am not familiar with the games much themselves.

Call of Duty: Black Ops 4
-Black Ops Pass
==>Contains 4 Zombie maps and 12 regular maps, not sold separately. Also includes a bonus Zombies map "Classified" which is the only one sold separately.
-Classified (Zombies)
==>1 Zombie map.
I don't know how you would enter these ones, since the Black Ops Pass includes itself as well as another DLC. Also, you don't usually do season passes, but in this case, the season pass IS the DLC pack. >_< My suggestion would be just to make the two separate entries, Black Ops Pass and Classified, and people with the pass just know that they have the one extra map. Just reading the next game, it looks like this may be something they do often, so it may be prudent to do it that way.

Call of Duty: WWII
-Season Pass
==>Contains the 4 DLC Packs below. Also contains 1 exclusive map, Carentan, not sold separately. I don't know what to do in this case. It clearly is a season pass, but comes with 1 bonus map.
-The Resistance (4 regular maps, 1 zombies map)
-The War Machine (4 regular maps, 1 zombies map)
-United Front (4 regular maps, 1 zombies map)
-Shadow War (4 regular maps, 1 zombies map)

Call of Duty: Infinite Warfare
-Season Pass
==> Contains the 4 DLC Packs below.
-Sabotage (4 regular maps, 1 zombies map)
-Continuum (4 regular maps, 1 zombies map)
-Absolution (4 regular maps, 1 zombies map)
-Retribution (4 regular maps, 1 zombies map)

Call of Duty: Black Ops III
-Season Pass
==> Contains the first 4 DLC Packs and Bonus Zombies map "The Giant" (sold separately) below. It does NOT include the "Zombies Chronicles" DLC pack.
-Awakening (4 regular maps, 1 zombies map)
-Eclipse (4 regular maps, 1 zombies map)
-Descent (4 regular maps, 1 zombies map)
-Salvation (4 regular maps, 1 zombies map)
-The Giant (1 zombies map)
-Zombies Chronicles (8 zombies maps, again NOT part of the Season Pass)

Call of Duty: Advanced Warfare
-Season Pass
==> Includes the 4 DLC packs below, as well as a bonus map Atlas George (also sold separately)
-Havoc (4 regular maps, 1 zombies map)
-Ascendance (4 regular maps, 1 zombies map)
-Supremacy (4 regular maps, 1 zombies map)
-Reckoning (4 regular maps, 1 zombies map)
-Atlas George (1 map, also sold separately. Also included with the Atlas Limited edition of the game, if you want to make something of that. Also also included with the Atlas Limited Pro edition of the game, but that came with the Season pass anyhow, so, redundant)

Call of Duty: Ghosts
-Season Pass
==> Includes 4 DLC Packs below
-Onslaught (4 regular maps, 1 extinction map - an alternative to zombies)
-Devastation (4 regular maps, 1 extinction map)
-Invasion (4 regular maps, 1 extinction map)
-Nemesis (4 regular maps, 1 extinction map)

Call of Duty: Black Ops II
-Season Pass
==> Includes 4 DLC Packs below, and 1 bonus zombies map "Nuketown Zombies" which is also sold separately.
-Revolution (4 regular maps, 1 zombies map)
-Uprising (4 regular maps, 1 zombies map)
-Vengeance (4 regular maps, 1 zombies map)
-Apocalypse (4 regular maps, 1 zombies map)

Call of Duty Modern Warfare 3
-I could not find anything about a Season Pass. Hurray? Also, I'm going to stop specifying what kind of map. We get the idea. Also, below you'll see Content Collections (each sold separately) and Content Packs (I could not see that they were sold separately - only as part of the Collections or if you had the Call of Duty yearly subscription).
-Content Collection 1
==> Includes Content Pack 1 (2 maps), Content Pack 2 (1 map), and Content Pack 3 (3 maps).
-Content Collection 2
==> Includes Content Pack 4 (2 maps) and Content Pack 5 (5 maps)
-Content Collection 3: Chaos Pack
==> Includes Content Pack 6 (4 maps), 1 map from Content Pack 7, Content Pack 8 (2 maps)
-Content Collection 4: Final Assault
==> Includes the other 2 maps from Content Pack 7, and Content Pack 9 (3 maps)

Call of Duty: Black Ops
-No season pass again, that I can see.
-First Strike (5 maps)
-Escalation (5 maps)
-Annihilation (5 maps)
-Rezurrection (5 maps - also included with some premium editions of the game)

Call of Duty: Modern Warfare 2
-Stimulus Package (5 maps)
-Resurgence Pack (5 maps)

Call of Duty: World at War
-Map Pack 1 (4 maps)
-Map Pack 2 (4 maps)
-Map Pack 3 (4 maps)

Call of Duty 4: Modern Warfare
-Variety Map Pack (4 maps)

Call of Duty 3
-Bravo Map Pack (5 maps)
-Valor Map Pack (5 maps)

Call of Duty 2
-Skirmish Map Pack (2 maps)
-Invasion Map Pack (5 maps)

I did not include any free map DLC, or early access maps with special editions or season passes that soon became free DLC. I'd consider those to be part what you get with the base game.

I was on a roll, so I did them all.
I'm exhausted. :D

Got some more FamiCom games that were missing (or at least I couldn't find them).

Binary Land
https://www.pricecharting.com/game/famicom/binary-land

Reigen Doushi (aka Mr Vampire - based on the Mr Vampire movie)
https://www.pricecharting.com/game/famicom/reigen-doushi?q=reigendoushi

Dough Boy
https://www.pricecharting.com/game/famicom/dough-boy?q=dough

Star Wars (Namcot - 1987)
This is a different game than the NES released Star Wars game by JVC in 1991
https://www.pricecharting.com/game/famicom/star-wars

@moho_00 Thanks! That was super quick!

Hi! Could you add these games to the website? I just started on the website, so there is a bulk, sorry.

Detective Di: The Silk Rose Murders https://store.steampowered.com/app/792040/Detective_Di_The_Silk_Rose_Murders/

Barney’s dream cruise https://store.steampowered.com/app/1052210/Barneys_Dream_Cruise_A_Retro_Pixel_Art_Point_and_Click_Adventure/

Metaphobia https://store.steampowered.com/app/1220930/Metaphobia/

Dr. Doyle & The Mystery Of The Cloche Hat https://store.steampowered.com/app/1106150/Yet_Another_Hero_Story/

Nelly Cootalot: Spoonbeaks Ahoy! HD https://store.steampowered.com/app/763030/Nelly_Cootalot_Spoonbeaks_Ahoy_HD/

Agatha Christie: Evil under the Sun https://www.giantbomb.com/agatha-christie-evil-under-the-sun/3030-9164/

Mystery House https://www.giantbomb.com/mystery-house/3030-2744/

The Mystery Of Woolley Mountain https://store.steampowered.com/app/521560/The_Mystery_Of_Woolley_Mountain/

Joyfess Ep1: Martin's Secret Recipe https://store.steampowered.com/app/1095700/Joyfess_Ep1_Martins_Secret_Recipe/

The Terrible Old Man https://store.steampowered.com/app/1147030/The_Terrible_Old_Man/

Drowning Cross https://store.steampowered.com/app/1091960/Drowning_Cross/

Kyle is Famous https://store.steampowered.com/app/1186740/Kyle_is_Famous/

There Is No Game. Jam Edition 2015 for some reason I cannot post a link to it.

I will come back later once I’ve gone through my wishlist.
Thanks in advance!

Hello,
Please add game.
BADLAND 2 - https://apps.apple.com/ru/app/badland-2/id1007120869
Thank you!!!

Part 2.

Fenimore Fillmore: 3 Skulls of the Toltecs https://store.steampowered.com/app/977300/Fenimore_Fillmore_3_Skulls_of_the_Toltecs/

In Other Waters https://store.steampowered.com/app/890720/In_Other_Waters/

Heal https://store.steampowered.com/app/1056610/Heal/

Edgar - Bokbok in Boulzac https://store.steampowered.com/app/954860/Mad_Cats_World_ActhiddenA_Comix_Game/" target="_blank">https://store.steampowered.com/app/952460/Lovecraft_Quest__A_Comix_Game/

The Wanderer: Frankenstein’s Creature https://store.steampowered.com/app/966670/The_Wanderer_Frankensteins_Creature/

The Escaper https://store.steampowered.com/app/1234520/The_Escaper/

Death and Taxes https://store.steampowered.com/app/1166290/Death_and_Taxes/

Thrillgate https://store.steampowered.com/app/1248030/Thrillgate/

Cat and Ghostly Road https://store.steampowered.com/app/994340/Cat_and_Ghostly_Road/

The Cult: Marduk's Longest Night https://store.steampowered.com/app/1074220/The_Cult_Marduks_Longest_Night/

Drawn Down https://store.steampowered.com/app/1067400/Drawn_Down/

Demons Never Lie https://store.steampowered.com/app/1138410/Demons_Never_Lie/

Madievals https://store.steampowered.com/app/916240/Madievals/

Part 3. I feel so bad there are so many. I would have gladly added them myself, but there is no such option :(

Summit of the Wolf https://store.steampowered.com/app/1092800/Summit_of_the_Wolf/

Timpu's treasure https://store.steampowered.com/app/1186690/Timpus_treasure/

The Hand of Glory https://store.steampowered.com/app/961010/The_Hand_of_Glory/

Saint Kotar: The Yellow Mask https://store.steampowered.com/app/868770/Saint_Kotar_The_Yellow_Mask/

Dorian Morris Adventure https://store.steampowered.com/app/898490/Dorian_Morris_Adventure/

Aurora: The Lost Medallion Episode I https://store.steampowered.com/app/1088610/Aurora_The_Lost_Medallion_Episode_I/

Palladium: Adventure in Greece https://store.steampowered.com/app/1137270/Palladium_Adventure_in_Greece/

TOHU https://store.steampowered.com/app/1075200/TOHU/

Greyhat - A Digital Detective Adventure https://store.steampowered.com/app/795420/The_Darkside_Detective__Season_2/

When The Past Was Around https://store.steampowered.com/app/1164050/When_The_Past_Was_Around/

Encodya https://store.steampowered.com/app/1137450/Encodya/

Willy Morgan and the Curse of Bone Town https://store.steampowered.com/app/1097110/Willy_Morgan_and_the_Curse_of_Bone_Town/

The Almost Gone https://store.steampowered.com/app/1115780/The_Almost_Gone/

Justin Wack and the Big Time Hack https://store.steampowered.com/app/1131670/Justin_Wack_and_the_Big_Time_Hack/

Brassheart https://store.steampowered.com/app/1072550/Brassheart/

One helluva day https://store.steampowered.com/app/603680/One_helluva_day/

Part 4 Almost done!

Text Adventure: Dungeon Empire https://store.steampowered.com/app/601210/Text_Adventure_Dungeon_Empire/

Whateverland https://store.steampowered.com/app/1175840/Whateverland/

There Is No Game : Wrong Dimension https://store.steampowered.com/app/1155460/The_Academy/

Port Valley https://store.steampowered.com/app/904450/Port_Valley/

Mutropolis https://store.steampowered.com/app/1037120/Mutropolis/

3 Minutes to Midnight™ - A Comedy Graphic Adventure https://store.steampowered.com/app/1055850/Inspector_Waffles/

Super Helpful Man https://store.steampowered.com/app/851210/Super_Helpful_Man/

DØM RUSALOK https://store.steampowered.com/app/1281420/DM_RUSALOK/

Slender Threads https://store.steampowered.com/app/1116480/Slender_Threads/

Impostor Factory https://store.steampowered.com/app/1182620/Impostor_Factory/

The Button Witch https://store.steampowered.com/app/1198270/The_Button_Witch/

Crowns and Pawns https://store.steampowered.com/app/1125910/Crowns_and_Pawns_Kingdom_of_Deceit/

Nine Noir Lives https://store.steampowered.com/app/914890/Nine_Noir_Lives/

Rosewater https://store.steampowered.com/app/1226670/Rosewater/

The Night is Grey https://store.steampowered.com/app/1281490/The_Night_is_Grey/

Orbis Fugae https://store.steampowered.com/app/1237190/Orbis_Fugae/

Backbone https://store.steampowered.com/app/865610/Backbone/

Part 5. The last ones, I swear!

The Crimson Diamond https://store.steampowered.com/app/1098770/The_Crimson_Diamond/

Zniw Adventure https://store.steampowered.com/app/904750/Zniw_Adventure/

Chicken Police https://store.steampowered.com/app/1084640/Chicken_Police/

Harold Halibut https://store.steampowered.com/app/924750/Harold_Halibut/

Plot of the Druid https://store.steampowered.com/app/1108170/Plot_of_the_Druid/

Reality Falls https://store.steampowered.com/app/734470/Reality_Falls/

Framing Dawes, Episode 1: Thyme to Leave https://store.steampowered.com/app/1130820/Framing_Dawes_Episode_1_Thyme_to_Leave/

Children of Silentown https://store.steampowered.com/app/1108000/Children_of_Silentown/

Ira Act 1: Pilgrimage https://store.steampowered.com/app/438120/Ira_Act_1_Pilgrimage/

The Wild Case https://store.steampowered.com/app/1178230/The_Wild_Case/

The Last Crown: Blackenrock https://store.steampowered.com/app/291750/The_Last_Crown_Blackenrock/

Growbot https://store.steampowered.com/app/661680/Growbot/

Dragon Audit https://store.steampowered.com/app/594380/Dragon_Audit/

The Heist https://store.steampowered.com/app/1065860/The_Heist/

looK Inside https://store.steampowered.com/app/1119710/looK_INside/

Chook & Sosig: Walk the Plank https://store.steampowered.com/app/899470/Chook_Sosig_Walk_the_Plank/

Midnight Quest https://store.steampowered.com/app/698450/Midnight_Quest/

The Tower of Beatrice https://store.steampowered.com/app/775960/The_Tower_of_Beatrice/

Welcome to Elk https://store.steampowered.com/app/1015940/Welcome_to_Elk/

INCANTAMENTUM https://store.steampowered.com/app/1182310/INCANTAMENTUM/

Hi, please add:
Breed - https://www.gamespot.com/games/breed/
FIFA Manager 10 - https://www.mobygames.com/game/fifa-manager-10
Gobliiins 4 - https://www.mobygames.com/game/gobliiins-4

Thank you

Please add Qix++ to the list for Xbox 360/One

https://www.microsoft.com/en-us/p/qix/bwz4kt247jc6?activetab=pivot:overviewtab

Can you please add Vosaria: Lair of the Forgotten? Thanks!

https://www.microsoft.com/en-us/p/vosaria-lair-of-the-forgotten/9ntt77b0qs1v

@Nocmin (myself)
The Elder Scrolls Online expansions have been added (in case anyone else was wanting them).

Could you act IndieGala as a provider? They have a lot of (some free) DRM-free games (besides Steam codes) on offer and deserve to be given an option of tagging a game as being from them instead of 'Other': https://www.indiegala.com/

Also, a game from Steam that I'm missing is Brukel: https://store.steampowered.com/app/1073900/Brukel/

Please add:

Legends of Runeterra

Release date: April 30 2020
Developer: Riot Games
Genre: Digital collectible card game
Platforms: Android, iOS, Microsoft Windows

Cover Art Link

@everyone - I think I've added everything, let me know if I missed anything!

Thanks @moho_00 !

Any plans on adding a feature where users can submit the necessary info and you / admins can just edit/update and approve the requests to add games?

Like have a simple form that requires users to enter the required fields and optionally provide cover art... this could possibly make things easier to get so many requests added

Cooking mama cookstar, on nintendo switch (I don't know if the PS4 version will exist or not)

@moho_00 Perfect! With the latest additions, I now completed my full collection and wish list!
Thanks a lot!

Thank you so much @moho_00!

Just added my collection. I didn't find the following games in Completinator. Please add:

Steam
Black Hat Cooperative
Capitalism 2
Mass Exodus Redux
VR: The Puzzle Room

Tam Tam Paradise
https://www.gamespot.com/games/tam-tam-paradise/

Family Trainer
https://www.amazon.de/Bandai-Namco-Entertainment-Family-Trainer/dp/B0019KAP9G

Moorhuhn Adventure
https://www.amazon.de/Ak-tronic-Moorhuhn-Adventure-Schatz/dp/B000117D4Y

Dancing Stage Euromix
https://gamefaqs.gamespot.com/ps/581037-dancing-stage-euromix

Goo Goo Soundy
https://gamefaqs.gamespot.com/ps/575952-goo-goo-soundy

Dance! Dance! Dance!
https://gamefaqs.gamespot.com/ps/574639-dance-dance-dance/data

EyeToy: Kinetic - Combat
https://www.amazon.de/Sony-EyeToy-Kinetic-Combat/dp/B000IB119U

Super Karts
https://www.amazon.de/Nordic-Games-Super-Karts/dp/B004E8LKPS

Marbles! Balance Challenge
https://www.amazon.de/Konami-Marbles-Balance-Challenge/dp/B0021BA2S6

Damaged Core
https://www.oculus.com/experiences/rift/660396644063513/?locale=de_DE

Singstar Anthems
https://www.amazon.co.uk/Playstation-9624479-SingStar-Anthems-Solus/dp/B000FS36XU

Singstar The Dome German Version
https://www.amazon.de/Sony-SingStar-The-Dome/dp/B0009SCH6S

Jam with the band
https://en.wikipedia.org/wiki/Jam_with_the_Band

SingStar Summer Party
https://www.amazon.de/Sony-9900320-SingStar-Summer-Party/dp/B00170F4QC/

SingStar R & B
https://www.amazon.de/Sony-SingStar-R-B/dp/B000VCVR6I/

Echoshift
https://www.amazon.de/Sony-9181859-Echoshift/dp/B0034MZUUQ

The Voice of Germany Vol. 2
https://www.amazon.de/Voice-Germany-Vol-PlayStation/dp/B00DSIEEAS

Singstar Guitar
https://www.amazon.co.uk/SingStar-Hits-Solus-game-only/dp/B000NORPQ0/

Singstar Pop Hits - German Version
https://www.amazon.de/Sony-9669586-SingStar-Pop-Hits/dp/B000OLG65S/

Singstar Bollywood
https://www.amazon.co.uk/PlayStation-9412755-SingStar-Bollywood-Solus/dp/B000V7FTF8/

Singstar Hottest Hits
https://www.amazon.de/SingStar-Hottest-Hits-PlayStation-2/dp/B001D62SJ6/

Singstar top.it
https://www.amazon.co.uk/Sony-9163657-Singstar-Take-That/dp/B002C73UVA/ref=sr_1_1?dchild=1&keywords=singstar+take+that&qid=1586368217&sr=8-1

SingStar Deutsch Rock-Pop
https://www.amazon.de/Sony-9625278-SingStar-Deutsch-Rock-Pop/dp/B000GG47LQ/

SingStar Deutsch Rock-Pop Vol. 2
https://www.amazon.de/SingStar-Deutsch-Rock-Pop-Vol-2/dp/B000VCVR5Y

We Sing Robbie Williams
https://www.amazon.de/We-Sing-Robbie-Williams-Nintendo/dp/B003ZVJK0C

Singstar Rock Ballads
https://www.amazon.de/Sony-9620396-SingStar-Rock-Ballads/dp/B000W179TC/

BeatMania Append 3rd Mix
https://gamefaqs.gamespot.com/ps/574755-beatmania-append-3rd-mix

BeatMania Append 4th Mix ~the beat goes on~
https://gamefaqs.gamespot.com/ps/575887-beatmania-append-4th-mix-the-beat-goes-on

Thank you!

MotoGP 20
https://www.amazon.com/MotoGP-20-PlayStation-4/dp/B085SJT2T8

@SenorMexicano
The Call of Duty map packs are done! Some of the thumbnails may change in the near future, but the DLC are now able to be added to your collection.
For ALL the CoD games. Let me know if I missed something.

Sensible World of Soccer for Xbox 360 and Xbox One needs to be added. Part of this month's Games With Gold.