Well, it looks like GOG.com has put up some crazy offer. According to them, from today to Saturday, December 14, at 1:59PM GMT, Fallout, Fallout 2, and Fallout Tactics will be up on their store for free. That's right - all three games, free of charge!
Moreover, every new account created at their site for the time being will get a few games for free right from the get-go! If you're interested in that deal, be sure to check it out!
Source: GOG.com
