Prison architect free for 72 hours from 16 Dec 2020 as part of 2020 Winter Sale. Go go go!

Brigador free for 72 hours from 22nd December 2020. Go go go!

Metro Last Light Redux is currently on giveaway until 1st of January 2021, 2 PM UTC.

Thanks for this! Was trying to post when it first came out but the site was too crowded

Nomads of Driftland is available for free.

Thanks for this! Was wondering whether to classify it as a demo lol.

Free Making of Kindgom Come Deliverance for Newsletter Subscribers that don't own it already.

Might have posted this before

Customers who pre-order this version of System Shock will receive System Shock 2: Enhanced Edition for free when SS2:EE is released.

Deadlight: Director's Cut is free until 22nd March 2021, 2 PM UTC if you own or buy any of the games featured in the Deep Silver weekend sale.

You're fast! Was just about to come in and post this!

If you already own the game you can claim a gift copy by the looks of it as well.

Free XIII! Go go go!

Good catch! I did not see this!

Free steel rats for 48 hours! Go go go!

Free Steel Rats - 3 hours left to claim the game.

Interesting Topic! Thank You.

Just for fun and to bring it up again and for future arch :D
a clickable List of all free games

https://www.gog.com/game/akalabeth_world_of_doom
https://www.gog.com/game/ascendant
https://www.gog.com/game/beneath_a_steel_sky
https://www.gog.com/game/bio_menace
https://www.gog.com/game/cayne
https://www.gog.com/game/delores_a_thimbleweed_park_miniadventure
https://www.gog.com/game/doomdarks_revenge
https://www.gog.com/game/eschalon_book_i
https://www.gog.com/game/flight_of_the_amazon_queen
https://www.gog.com/game/gwent_the_witcher_card_game
https://www.gog.com/game/higurashi_when_they_cry_hou_ch1_onikakushi
https://www.gog.com/game/jill_of_the_jungle_the_complete_trilogy
https://www.gog.com/game/lure_of_the_temptress
https://www.gog.com/game/the_lords_of_midnight
https://www.gog.com/game/nomads_of_driftland
https://www.gog.com/game/postal_classic_and_uncut
https://www.gog.com/game/sangfroid_tales_of_werewolves
https://www.gog.com/game/shadow_warrior_complete
https://www.gog.com/game/stargunner
https://www.gog.com/game/sunrider_mask_of_arcadius
https://www.gog.com/game/teenagent
https://www.gog.com/game/treasure_adventure_game
https://www.gog.com/game/tyrian_2000
https://www.gog.com/game/ultima_worlds_of_adventure_2_martian_dreams
https://www.gog.com/game/ultima_4
https://www.gog.com/game/war_wind
https://www.gog.com/game/worlds_of_ultima_the_savage_empire
...
and a live list of Demos if needed
...
and a live list of free DLCs if needed

Blessed be! ^