Rocket League. And then I'm not chilled.

Blast some bots in Quake 3.

Forza Horizon 5. I like to just drive around the map for a while, and maybe do a race or two, until I inevitably get bored after an hour or so. Repeat every week.

(until I bought a real life motorcycle to scratch that itch, and no, I'm not racing or being dangerous on my motorcycle)

Kerbal Space Program

Tetris Effect. The funny thing is I used to hate Tetris with passion, but somehow Tetris Effect has won me over. The music and sound effects are so ASMRish it's almost trance-inducing...

It might be more catharsis than unwinding, but dark souls/sekiro. I've been through them enough times that it's just comfortable.

BeamNG. Logged hundreds of hours just mindlessly driving around crashing into stuff and fucking around with vehicle customisations.

Chrono Trigger. I have a save that I just load up, do some things on, and then turn off when I'm done. I've beaten the game dozens of times, and I know every aspect in and out, so it's like flipping on the TV and catching an episode of a sitcom, I just roll with it and mellow out.

American Truck Simulator or Euro Truck Simulator 2. Pick a long hual, throw on a podcast or some music, and just cruise.

The Talos Principle (+ DLC) and its just-released sequel really fit this niche for me. I'm fighting severe burnout and was specifically looking for a game without time pressure, reflex-based gameplay, or (because I keep bouncing off of turn-based strategy games even though I believe that I love them) complicated stats-based systems.

TTP is about first-person puzzles in the vein of Portal. While some of the puzzles can be difficult, you can work through them at your own pace. The level structure makes it easy to drop in and out of the game whenever, and the gorgeous environments and soundtrack make the world just a generally soothing and immersive place to walk around in.

I like to play any type of horde clearing game where I can shut my brain off and just swing/shoot my way through a bunch of enemies. Some examples of this are deep rock galactic and vermintide 2. One scratches the shooty itch and the other scratches the swingy itch

If I ain't shooting or swinging I like to play roguelites. Slay the spire and faster than light are classics I keep returning to. Interested in trying out cobalt core soon which looks like a mix of STS and FTL

Good ol' vanilla survival Minecraft. Very fun with friends.

Minecraft, Doom (first two), Cities Skylines, and more recently, Unpacking.

OpenTTD

Animal Crossing New Leaf, Stardew Valley, Starfiled, Minecraft and Fortza Horazion 3,4 or 5.

openRCT2.

Genshin impact on PC is a masterpiece. The colors on my 4k monitor are just out of this world. I don't even do hard missions, I just go around the wild collect foods and stuff. So relaxing.

cyberpunk is actually great for that. Sometimes if I don't wanna do anything in particular I'll just... fight the police, lol. Or just randomly do some open world stuff, like drive around the badlands. Then if I'm feeling like doing something more "meaningful" I'll jump into an actual story quest

Shattered Pixel Dungeon. Which is weird because it's actually quite frustrating, but super rewarding if you win.

I really liked playing Talos Principle 2 the past days. makes you think not just about logic but also some aspects of philosophy. which, at least to me, is pretty relaxing.

Stardew valley and/or kerala space program.

Terraria

Celeste

Dwarf Fortress

Since everyone has already said more well known games, here are my Indie/small games

Islanders

Race the Sun

Skye

Superflight

Potion craft is great for this, just running a little potion shop making potions to order.

Terraria. I started a new character/world probably 200 times. Music is also bang on.

Path of exile for a few weeks every league

But I'm enjoying rogue lites / vampire survivors like games. There's a billion of them so you can just chill with one of them. I usually find a new one every other day too, some demo or whatever

Risk of rain 2 is also not something I would call a chill game. But it's definitely something you can just fire up and play for an hour

Skyrim was my chill game for years, but now I'd say Elder Scrolls Online. Everyone I know who plays ESO is super non-competitive and chill. It's just got a great vibe.