Of note: a giveaway that also gives out zero gift codes.

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Correction:
When purchasing "CDPR Goodies Collection", I already had:

Cyberpunk 2077 Goodies Collection
https://www.gogdb.org/product/1486144755
https://web.archive.org/web/20200624154700/www.gog.com/game/cyberpunk_2077_goodies_collection

and

The Witcher Goodies Collection
https://www.gogdb.org/product/1980301910
https://web.archive.org/web/20200316165924/www.gog.com/game/the_witcher_goodies_collection
https://web.archive.org/web/20210517150559/www.gog.com/game/the_witcher_goodies_collection

Checkout page displayed, to the effect of, since I had content from both giveaways, purchasing (for $0) would not add anything to my account.

After purchasing, then checking out again, gog gave me a gift code.

Here's what's in these goodie pack collections:

Cyberpunk 2077:
CP2077 wallpapers
CP2077 cover arts
CP2077 screenshots
CP2077 gang graffiti
CP2077 steelbook arts
CP2077 posters
CP2077 concept arts

The Witcher goodies pack appears to have absolutely everything except the games. I'd say that it worth claiming just for the soundtracks.

Thanks guys! :)

Free Horizon West DLC : Comic Book from the 5th till 9th August 2022

Another round of CDPR Collection Goodies from the 8th till 11th of August 2022 as part of CDPR 20th Anniversary Celebrations

If you have gotten both parts of the CDPR Goodies Collection before, then likely the only new elements this time around are the following.

The Witcher Goodies Collection
The Witcher 3 wallpapers (20th Anniversary) (3) 266 MB

Cyberpunk 2077 Goodies Collection
CP2077 wallpapers (20th Anniversary) (20) 1510 MB

They were all I was missing, aside from the following which I must have overlooked previously.

The Witcher Goodies Collection
Gwent Cards Backs (Winter Sale 2021) (27) 96 MB
Gwent Cards Arts (Winter Sale 2021) (108) 1003 MB
The Witcher Emoji Art (Winter Sale 2021) (33) 385 MB
The Witcher Old World Art (Winter Sale 2021) 17 MB
The Witcher Manga Art (Winter Sale 2021) (7) 95 MB

And I must have missed the following too, because I only had the Goodie Packs for The Witcher, part 1 and 2, unless I had discovered they were already available in each specific game section of my GOG library..

The Witcher Goodies Collection
The Witcher 2: Assassins of Kings Enhanced Edition - wallpapers (8) 13 MB
The Witcher 3: Wild Hunt - Game of the Year Edition - goodie pack 4300 MB
Thronebreaker: The Witcher Tales - goodie pack 2600 MB
The Witcher 2: Assassins of Kings Enhanced Edition - goodie pack (1) 2400 MB
The Witcher 2: Assassins of Kings Enhanced Edition - goodie pack (2) 2200 MB

I've tested most of the other files available and they are identical to previous versions.

New sale period, new free game for 72 hours. Stasis is free till the 25th of August so go go go!

Also, Dink Smallwood HD, which I expect to be a permanent freebie rather than a temporary one.

Oh yes! I just saw this! Thanks!

Even if it isn't, it's available DRM-free on two other sites and has been for over a decade:
http://www.reloaded.org/download/Dink-Smallwood/14/
https://www.rtsoft.com/pages/dink.php
It's also free on Android.
https://play.google.com/store/apps/details?id=com.rtsoft.rtdink

Note that GOG said Stasis is the first of four free games in the current sale.

And that does not include Dink Smallwood HD, as GOG said it is permanently free.

It being (legally) free elsewhere on the internet is precisely why I expect it to remain free here, at least for the forseeable future.

Can confirm: Mafia II was added but not Mafia III.

You probably need to have Mafia III with all the DLC. Though the Definitive version is the same number of files and size, but seemingly no DLCs by the look of it.

The Definitive version of Mafia II is a lot more files and much bigger than the Director's Cut version, as you have probably noted.

EDIT
All current owners of Mafia II: Director's Cut will receive Mafia II: Definitive Edition for free.
All current owners of Mafia III will receive Mafia III: Definitive Edition for free. (and it appears to have the DLC built in)