From the games here on GOG I would whole heartedly recommend the System Shock series. Drips with atmosphere and is such a well made game.

For a game that isn't available on GOG I loved Condemned: Criminal Origin.

Happy Halloween all.

Limbo, Inside, DARQ, Layers of Fear, Outlast, Alien Isolation, ...

Slenderman still scares me and I really liked playing Little Nightmares!

First, thanks for this giveaway.
My game recommendation is Obscure, it's... an obscure game where you play as a grup of high school student in one of the most danger school in the world where you can die any day... So, an avarage American High School...
Now leaving jokes behind, this is a game about a bunch of student that go looking for their missing friend and get trapped in a school full of monsters, you have to found out what is happening and leave the pleace before is too late.
The story is the typical adolescent horror movie, full of monster, cheese dialogs and insinuations about sex. This grup of horny teens will have to combine their abilities to overcome all the obstacles and puzzles to reach the end and beat up the bad guy.
The game is a clear pruduct of it's time that scream 2005 for all the pleaces, from the music, to the clothes of the characters and their personalities so stereotypical, but is a really fun game that will give you a good dose of scares! I recommend this game and it's sequel too, Obscure 2, full of emos and gothic chicks! 10/10

I gotta go with F.E.A.R. Platinum.

I think Darkwood is pretty under rated but it has a really good atmosphere and when night falls its incredibly scary.

Someday You'll Return

It's weird how everything can come at the right time. It was in these days of October that I was led to this Czech gaming pearl to draw my story from the depths of my own unconscious, which I began to create six years ago, when life separated me from my daughter. Incredible healing of wounds of fate. There are simply no coincidences and I thank the creators of this game wholeheartedly for such a healing ride. The nightmares are gone in peace and quiet. All that remained was life, joy and love. Now I fully believe that everything was as it should be. It fit in and made sense to me as if I could see it all over my own body and over the universe. So I have never had such a gaming experience and I don't think I'll ever have it again. I feel like the developers made this game to heal the pain in the depths of my soul. Thank you, thank you, thank you ...

Good horror game cannot be based on cheap jump scares, I do not want stroke but fear. Aesthetic feeling from game graphics must show, that there is something really bad. Not sure what, but corridors are narrow and in the background monotonic machinery sound make impossible listen if somebody goes after me. Still there is fantastic sound system and from my speakers can be clearly identified, that something moved on left side. Should I go and see? My pipe is almost bend, if it is not some dog I should run. There is temporary safe spot in my room, but still I must go look what is inside hole.

My recommendation is Dead Space. This is the first game that has totally immersed me thanks to its superb HUD and interface. Everything I needed to know in the game ammo, health, maps, logs, everything was a part of the character's design so using or monitoring any of these things didn't work to subtly break my suspension of disbelief. It also made for a more claustrophobic experience, as in other games you get to relax when you go to check the map, make upgrades to your equipment, or reorganize your inventory. But in Dead Space, the game never stops. I've been given small heart attacks when I thought it was safe to read one of the many logs that provide the background story, only to be abruptly attacked by a necromorph. They must have copyrighted the idea because otherwise, I can't understand why more games don't do the same. I can start playing that game at any point and it sucks me right in. A true classic and I'm hoping we get Dead Space 2 here someday.

The Japanese Clock Tower series. Much lesser knew than Resident Evil or Silent Hill. The Scissorman is terrifying! I wish they had a remake/sequel. The music is especially creepy!

DEFCON is the scariest horror game, because it's too real

My recommendations are Gabriel Knight, I have no mouth and Phantasmagoria. With any of them you will not choose wrongly.

For a real old game that runs on a potato I recommend Realms of the Haunting. Yeah so the graphics are 1990's 2.5d but the atmosphere and gameplay are great. It also has a resonable story and well done FMV sequences (for the time). Oh, and its pretty cheep. Worthy of being a G.O.G.

Haunted House.

Deathsmiles counts as a horror game, right? Surely it does. In which case:
Deathsmiles (97% positive on Steam) is easily my #1 recommendation out of all horror games on PC, no question (just so long as you can tolerate the game's pandering to a certain audience). It's got finely-crafted bullet patterns as fearful as the monsters spewing them, along with much higher production values than your average shoot-em-up. And it seems to be a tad more accessible than the average Cave shmup, difficulty-wise (but there's still plenty there for those who want to seek out more of that). Alas, at the moment, this recommendation is aimed more at GOG's curators than at GOG's customers. :/

(Outside of PC, though, I love Guwange even more. That one's easily one of my favorite arcade games of all time. If you don't mind a challenge, please check it out if you can.)

Honorable mention goes to Akiragoya's/Artesneit's games, which tend to include wonderfully creepy Giger-esque body horror that's right up my alley.

(That said, I've gotta say, I'm really looking forward to playing each of these:
A Plague Tale: Innocence
Agony
CARRION
Darkwood
Detention
Devotion
DreadOut (like a poor man's Fatal Frame?)
Hellblade: Senua's Sacrifice
Observer: System Redux
Succubus
WORLD OF HORROR,

and I would love the opportunity to try:
Alien: Isolation
DreadOut: Keepers of The Dark
DreadOut 2
FATAL FRAME / PROJECT ZERO: Maiden of Black Water (kinda like Shoot the Bullet in first-person?; well, maybe not exactly),

but of course I can't recommend these with full confidence without having actually played them just yet, even if they do look quite promising from most of what I've gathered.)