SOMA on GOG?

[Traggey]

There's a whole bunch of them.

http://steam.wikia.com/wiki/List_of_DRM-free_games

These games do not require steam to be running at all when played, in the cases of these games steam works just like GOG, download the game. Keep it forever even if the servers go down.

So yes, there's a whole bunch of DRM free games on steam.
DO YIR FOOKIN' RESEARCH BEFUR CORRECTIN' PEOPLE