DRM Free Time Machine Sale
Starting at 1983, GoG is going through the years with one highlight of that year (well, since some are in bundles, they're wonky... seemed to be based on an average).
To add to the fun of the sale, each game has a +1/-1 sec and you can vote whether to make the time it's available longer or shorter. You also vote with your money; each buy increases the time it's available on sale by 3 seconds.
GoG's been having some decent DRM-free discount goodness lately with fun little gimmicks on top of them.