Some more:;

Gamesrocket:
https://www.gamesrocket.com/pc-mac/drm-free.html
https://www.gamesrocket.de/pc-mac/drm-frei.html
https://www.gamesrocket.co.uk/pc-mac/drm-free.html
https://www.gamesrocket.fr/pc-mac/jeux-sans-gnd.html

Gamebillet:
https://www.gamebillet.com/allproducts?drm=84&q=&adv=true

Zodiac-Store:
http://www.zodiac-store.com/
https://www.google.de/search?hl=de&as_q=&as_epq=%22DRM+Free%22&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=http%3A%2F%2Fwww.zodiac-store.com%2F&as_occt=any&safe=images&as_filetype=&as_rights=

Dlgamer:
https://www.dlgamer.com/
https://www.google.de/search?hl=de&as_q=%22no+drm%22&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=dlgamer.com&as_occt=any&safe=images&as_filetype=&as_rights=

Wingamestore:
https://www.wingamestore.com/
https://www.google.de/search?lr=&hl=de&as_qdr=all&ei=dUJzWtHULI3WkwXvkYTYCA&q=%22DRM+Free%22+site%3Awingamestore.com&oq=%22DRM+Free%22+site%3Awingamestore.com&gs_l=psy-ab.3...6130.6130.0.6423.1.1.0.0.0.0.136.136.0j1.1.0....0...1c..64.psy-ab..0.0.0....0.A4zH6eHz51s

Apparently , the Crytivo store ( crytivo.com) is also DRM-free. From what I understand, when you buy a game from it, you get a steam Key as well as a drm-free copy of the game on the site. Keep in mind that the store is quite new and that everything might not be already in place, but this is what the developpers explained on discord. A few games for now ( and mostly EA)but most looks promising ( especially Universim and Prehistorik Kingdom) so you should definitely keep an eye on it and support them if you can :)

Not sure what those other things are, but when I wrote about it (DRM needed to ban cheaters for good from an online multiplayer game), I was thinking of public servers as those are where I play. I know one can control things himself when he is playing on a private server with people he knows personally.

On public servers, there has to be some way to ban a cheating player from the server or even from the game for good. The most straightforward way for that I can think of is that the game he has bought is tied to his online account, so if he is caught cheating, the game publisher/server admin can make sure that that account, and that purchased copy of the game, can't join the server(s) anymore.

So there is a real incentive for people not to cheat, as then their copy of the game would become pretty much useless on public servers. The only way they could overcome that was to create a new account, AND buy a new copy of the game.

The problem still is in free-to-play online games like Team Fortress 2. Since the game is free, you can just create a new temp Steam account to play TF2, if your earlier temp account got VAC banned. In fact, the little I read about "cat-bot" cheater bot program (it is open source, running on Linux) that has been a bane on TF2 casual public servers lately, apparently it automatically creates up to nine temp Steam accounts for the cheater bots, without the user having to create them manually. That's why the "cat-bots" just kept appearing even if people reported and voted them out.

(Luckily, I haven't seen the cat-bots anymore for like 1-2 weeks, so maybe Valve finally did something about them. Here's hoping they don't come back, apparently the original author was originally banned already in last August, but the bots still came back later.)

At that point I had to wonder, why has Valve made it so easy to create new Steam accounts, even by a script (if I understood right)? Isn't there even a simple CAPTCHA check, and if they really wanted to stop it, IMHO they could require some kind of identification, even merely a credit card, for creating an account. Maybe it isn't that simple and that certainly has some pitfalls too (e.g. some kind uses his dad's credit card on Steam and it gets banned because the stupid kid tried some cheats, and the father can't play the same game either anymore...).

Oh you're right in Braid's case; I didn't see the words "Humble Widget". However I think there are still some indies that sell DRM-free games directly from their sites.

BTW, would any games on Origin and/or uPlay be considered DRM-free in the same vein as Steam? (dunno if those services have been mentioned yet)

depends how you define DRM free. Correct me if I'm wrong, but I think Soldak use one-time key activation (not server based) for their games. The same goes for for example the games from KnuckleCracker

How come Zoom is still selling the 1st Grid game? I was under impression that expired license should be a valid reason to remove it from sale for all stores! O.o

Could be, I don't know first hand since I haven't bought any of their games directly from them. Just assumed that if they offered them completely DRM-free here on GOG, they would be the same on their website.

But now that you mention it, maybe the games from Caravel also work this way... :\

The problem is, you have to catch people cheating, if only cheating is your problem. Getting away with cheating is pretty easy if it doesn't have good anti-cheat measures. Even with online games there are sneaky methods if you don't have absolutely perfect design (everything shy of rendering must be server side, and that gets expensive, quick). I've seen some pretty sneaky anti-cheats for local games, though. They're not perfect, but they're reasonable, and i have an idea in my head that would work effectively: store relevant variables in multiple formats in dynamic locations encrypted and cross reference. The would be cheater would have to not only be aware of how to find them in what formats, but to even do that they'd have to re-encrypt the numbers they're looking for, decrypt them (and there's sneaky methods for that), but they'd also have to make sure they hit all of them. Sure, they could hit them during the calculation phase before they're stored back in all those formats, but that's a race condition and really, really easy to get caught on. Simply crash the program when that happens. Now, if you're dealing with this kind of problem, only allow 2 or 3 connections per IP. If you have more people in your house playing it, maybe you could get a LAN game started? There's also the idea that, if you ban 2 people from the same IP, autoban the IP for the specified time. Alot of networks actively seek out proxies, so unless you have some private proxies (limiting your ability to do this too much), that helps. You could also require a port range to be open, or something, and require that the game return encrypted data based on what the server sends to that port. Of course this can be thwarted, but update every now and then if you want to have public server games (honestly, i don't like non-distributed multiplayer). You are responsible for your information. If your kid steals your credit card, it's your own fault. And you bring up a good point: why isn't there a captcha in the game? That'd stop bots COLD, even if you had multiple accounts. And you can easily get creative with the captchas, so they're not overly invasive. "Which card is Geralt?"

Thanks, I'm bookmarking this thread for future usage.

Enlight Software sells some games directly. The only one I bought was Wars & Warriors: Joan of Arc, which is DRM-free (AFAIK)
http://www.enlight.com/

And the 3D Realms store lets you buy the old Apogee and 3D Realms games DRM-free:
https://3drealms.com/catalog/

Virtual Software has a handful of DRM-free games now, they used to have all the Softdisk games like Rescue Rover, Hovertank 3D, and Keen Dreams:
https://virtualsoftware.com/

I have to go now but I will collect your info and edit OP later today. Thank you, everyone!

ADDED:
3D Realms
Arcen Games
Crytivo
DLGamer
Enlight Games
Gamebillet
Gamesrocket
Knuckle Cracker
Soldak
Virtual Software
WinGameStore
ZODIAC

For Hitman IO Interactive regained developer independence from Square Enix and have retained the rights to the Hitman franchise so I don't know how long they will continue selling the games for, also all the PC versions they have available are Steam codes only.

Square Enix were planning on selling the developer and some of the studio heads put together enough capital to buyout the studio themselves and retain the IP.

With the breach of privacy GOG just did, this thread suddenly became much more relevant.