Fallout, Fallout 2 and Fallout Tactics: Brotherhood are now back on the and waiting to be downloaded after a protracted legal skirmish between original franchise owner Interplay and current owner Bethesda.
Said skirmish resulted in a $2 million settlement which transfers all rights to the Fallout IP over to Bethesda for good.
There's no news on whether the games will ever be released on GOG.com; the DRM-free site was also forced to remove the titles from their listings as part of the legal action.
Still, at least there's an easy way to access theseagain. You can grab them for $10 each, or for $20 in a bundle package.