It should also be mentioned that there's a massive sale on GOG in general.
For the next 20 hours or so: "Alan Wake" titles for 90% off, the suite of DnD games for 80% off.
50% off most other games, and there will be daily deals similar to the above Alan Wake and DnD sales until July 5.
All of it DRM-free.
Very good stuff, even if you're a casual gamer.