GOG.com (Good Old Games) is offering the original Fallout for free over the next two days, in promotion of their revamped website and product lineup. In addition to a slick new layout, GOG is expanding its product line to include newer titles and non-Windows games.
GOG, which is owned by CD Projekt, the Polish studio behind The Witcher series, has focused on selling DRM-free classics up until now, but they'll be expanding that focus to include newer titles (they're still adamant about them being DRM-free, though).
So, if you haven't had a chance to give it a try, head over to GOG right now and check it out. Since it's optimized for modern systems, you can rediscover an old favorite, and new players will get a chance to check out the series' pre-Bethesda roots. Just don't go in expecting fancy graphics or a FPS and you'll do just fine.
Image via Fallout Wiki
Thanks to zman982 for the tip