Yup, I know it`s an old game but its still pretty fun. GOG (Good Old Games) is offering the classic PC shooter Duke Nukem 3D: Atomic Edition free until December 14th.
Along with the game, GOG is also throwing in HD wallpapers, ringtones, avatars and artwork as bonus content. The game includes DOSBox which is automatically installed and configured with the game.
GOG is a nice repository of older titles, so have a look through their catalogue you might find something else you like
get it here