Fallout: Equestria, by KKat, with a foreword by SkelePone

Fallout. With ponies! Set in an alternate future, one pony must learn to survive in a blasted, poisoned land... and possibly, with the aid of friends made along the way, bring new light into the darkness of post-apocalyptic Equestria.
With Foreword, Between Part commentary, and Afterword by SkelePone.

Unaltered, with full credit to the original author, KKat, and with beautiful fan art every chapter (soon).