This looks interesting. So one can get the installers for these games through Steam and use them without running their client and etc.? I thought all their games require the client running and it's already DRM for me which I don't accept.
Is there an easy way to filter games by this criteria on Steam itself?
Unfortunately no Steam uses its own package format, so it must run the installer the first time to get steam to unpack it. Steam provides DRM but it is up to the author of the game to use it, their own, or none as they see fit. And no Steam doesn't provide any clues as to what DRM is used by a game.
It seems like I have run across other games that use secuROM but don't mention it. I don't know if it was because that was before they added the listing or because there was no restriction like the activation limit.