At least Portal 2 still has it. I've tried to run a not very old backup of the game recently and it didn't work.
You get into the game menu, but loading/starting the campain results in error message.

So you support one platform which has DRM in many cases (Epic), but you punish another for having DRM in a very small minority of games. Ok

I just avoid buying games with DRM, that works for me. If enough people do it, the publishers might learn.

Yes. Epic did not promise DRM-free. They are not wrong when they use it. I just don't like it so I don't buy that kind of games, but there are still many games without drm that I can enjoy. They also give many games for free that I love (most of them are drm-free so they are not a minority like you say).
I will not support gog liars.

Read the part with the minority again. What you disagree with is not what I said. I would never say that (edit: well, someday, maybe. But currently: no).

I guess we'll see less of you then if you are finished with GOG?

I still like the forum.
Forum and games that I already own are an exception. Thread like this one are good reason to still use the gog forum since I still think drm free is the way to go and that's why I don't want to support gog anymore since they now release games with drm

For some reason people here seem to be confusing CEG with the Steam client requirement.
CEG tied the executable for your specific hardware and software. It was very rarely used and Portal 2 never used it.
For CEG games you can usually use LumaCEG or a crack.
Most all Steam games require the Steam client and that's it. SmartSteamEmu or GoldBerg (Sometimes you'll need to use Steamless as well) usually work
AAA games most of the time use 3rdparty DRM especially Denuvo nowadays. Those require bypasses by the cracking scene (usually a cracked exe and/or a dll) and a scene scene steam emulator.

To play Portal 2 without Steam you can use:

For Portal 2 v4560 you can use client.dll and server.dll from the skidrow crack with SmartSteamEmu.
This version also works on XP

For Portal 2 newer than v4560 which only work on Vista+ then you'll need to use Goldberg with the "-steam" switch.
v6180 will work on XP but you'll need to use OneCoreAPI Ws2_32 files with Goldberg or use the fork of Goldberg for XP since Goldberg requires Vista+

We probably should not post any advise to use cracks in games in this thread to avoid it being locked by GOG. GOG allows discussions about cracks but advertizing certain cracks might still not be the best idea - even though this cetian game is not even available on GOG.

That's not true. Easy way of telling which Steam games have CEG - find the game in steamdb.info, click "Configuration", scroll down and if you see a "cegpublickey" row, it has (or had) CEG. It may have been removed, but Portal 2 was definitely setup for it at one point. Edit: Here's confirmation that it's definitely been in the game in the past.

Indeed. That was the original intention of the thread (a list of "portable" DRM-Free games without needing cracks / client emulators). Not to mention there's a separate thread for Steam games.

A heads-up: The new Outer Wilds DLC, Echoes of the Eye, IS NOT DRM-FREE. The DLC is not recognized if the Epic Store isn't running; the base game still works.

Not so good, as far as I'm concerned.
I had to have the Store Client running to get the game to start, but could shut the client down after starting the game.
I assumed using the correct commands in my shortcut would get round that, but never got far enough to test it.

Epic apparently has a new Overlay feature, Since the last time I bought anything from Epic (2020), and Kena was using it to show achievement popups, even though I didn't have the Epic Store Client running.

Turned out the game had an Epic Overlay DLL and/or Executable (going from memory it was a DLL).
As far as I could tell, you couldn't even turn this overlay off, in game, or even using the store client.
Terminating the running overlay (I use Process Hacker 2, as my Task manager), just resulted in the game restarting it.

I hate achievements, and especially store client/in game overlays.
The only reason I get over 80% of my games from GOG, is the offline installers.
Meaning I have no Store Client running.
So I was done with the game, at that, and refunded it, at that point.

Looking to me that running Epic Games Store Client free, is more down to their incompetence, rather than design.
With Outer Worlds DLC needing Store Client running, and now forcing client overlays, without a store client.
More Epic incompetence?

I'm pretty much done with Epic Games at this point.
Only thing they had, going for them was store client free gaming, without that, they have nothing.

The "Free" games, are bare bones (Without DLC/Expansions) packages, and games I don't want, even for free.
I already own all the old games that I do want, and that's here on GOG.
Much like "Game Pass", their (Not so) huge list of old games, has absolutely no value to me.

2064 Read Only Memories works out of the box.

I copied the folder directly to C: from another PC that has no internet connection and played the Prologue and up to Chapter One, I was able to save and load. Tested on Windows 7.

https://twitter.com/vs_evil/status/1443240053874982914

You can add all the Versus Evil release to the list.

In contrast to Steam, I could not get Europa Universalis IV to launch without the client on Windows 10.

Unfortunately Train Sim World 2 does not work with the switches -AUTH_PASSWORD=0 -EpicPortal and can be added to the DRMed list.

The Eternal Cylinder may be fully DRM-free on the EGS.

I installed the game on a Win10 computer, copied the files over to an old Win7 machine which has never had the client installed and isn't connected to the internet - and I was able to play the game with no command line trickery.

Keep in mind, though, that I played only up until the first time the cylinder gets stopped by the towers, which isn't very far at all. So I have no idea if problems may be cropping up later on. Tried saving and loading, though, and it works flawlessly.