Fallout, Fallout 2 and Fallout Tactics are free on GOG right now through Saturday, December 14 at 9AM ET. All this free Fallout is in celebration of GOG's 2013 DRM-Free Winter Sale, which offers more than 600 games for at least 50 percent off through December 29 at 9AM ET.
GOG has roped in a few well-known YouTube personalities to promote daily sales of up to 75 percent off, and GOG users can vote on bundles they wish to see 80 percent off the following day. GOG members are also able to choose one of three daily mystery deals. All purchases are covered by GOG's 30-day money-back guarantee, which allows players to get their money back if a game doesn't run or has game-breaking bugs.
The Fallout series is officially changing owners – from Interplay to Bethesda – on January 1, and GOG will have to remove Fallout, Fallout 2 and Fallout Tactics from its library. But they're free now, so go on and grab 'em.