The Humble Store gives you a DRM free version and a Steam version with a single purchase if both are available. That way you can enjoy Linux gaming both without DRM or through Steam.
can filter for Linux versions.
They don't seem to be able to filter for DRM-freeness (though, if you know a game is only available with DRM, they can filter for "DRM = Steamworks") but you can limit the effects of that by [url=http://isthereanydeal.com/#/filter:desura,gog,dotemu,shinyloot,humblestore,indiegamestand,gamesrocket,&price/0/5,&cut/50/100,&hidemac,&hideshops,&linux;/option:vouchers]filtering[/url] for the seven stores they track that, whether or not they actually have Linux content currently, are most likely to offer DRM-free versions.
(And the waitlist feature lets you set store filters on a per-game basis so you can exclude known DRM-riddled offerings from consideration.)
Now they just need to start tracking FireFlower Games
, , and [url=http://www.indievania.com/games?platform=Linux]Indievania
so I can bump the number of sites in my filter up to 10.
They will soon start to track FireFlower Games. :)