This is a Fallout Equestria (primarily) and Terminator crossover.

As the war between Equestria and the zebras pressed on, many members of the Ministries conceived of desperate strategies to end it through magical and technological creations of questionable nature. One of these was Project Infiltrator, a top secret project of the Ministry of Awesome. It's goal: to create a super spy that was the perfect blend of pony and machine. But just as its first subject was ready, the megaspells dropped, destroying Equestria and creating the Wasteland.

190 years later, Crystal Eclair awakens in a world of ruin and violence, completely clueless as to what happened to Equestria and herself. Her confusion grows into horror as she discovers that she is no longer a pony, but now a cybernetic zebra. With no other choice left, she sets out to find answers to her predicament. How will she handle the truth if she finds it? Will she find friends who can help her in a world that trusts no one? And what if those who have done this to her are still out there, eager for her to serve a new sinister purpose?

PS. This is not a Prequel to Broken Steel despite what a couple of websites that link back to this story say.

(Chapters 1 to 12 Edited by Alycorn~(CF), New Editor Double R Forrest. New description credit to Double R Forrest )

It has been nearly two hundred years since the megaspells rained fire down on the world, reducing it to a tainted wasteland. The ponies of Equestria get on by, but only just.

A lucky few survived in great underground shelters, the stables. Among these is the lost, and almost mythical, Stable 84. It was said that the stable in question was home to not ponies, but creatures who could change their faces with but a thought.

But that was just a myth, there was no way that the Equestrian Hive was real. Right?

(Be warned, spoilers for Fallout Equestria, Project Horizons and Pink Eyes may occur.)

Fallout Equestria is by Kkat, and can be found here.
TVtropes page here.
Cover art by Skijaramaz!
Edited by RC2101_Copey.
Featured on 18/03/2018.

After the events of the Day of Sunshine and Rainbows, Little Pip and Celestia spent they're maintaining the weather and watching the creatures of the wasteland below. With tons of time on their hooves, they spent it discussing life, history, the wasteland itself, and their former lives. This is stories of Pip and tia's new life with each other.

Vectors by Comeha

Now with a full game on Game jolt: https://gamejolt.com/games/Starwars90001/565049

This story is a sequel to Fallout: Equestria - Pip and Tia

A year after the events of the original Fallout Equestria Little Pip and Celestia watch over the Wasteland as its protectors, dishing out punishment and saving ponies where they can with the help of the SPP towers. But with the power to control the weather and the power to see anywhere in Wasteland question of power and how to use it comes up, the most the almost divine power Little Pip wields. This all comes to a head when a certain Security Mare prays to the Stable Dweller to bring judgment on the Hoof and free her of the burden.
Cover by Cazra: https://www.deviantart.com/cazra

Silence is golden. Creativity depends on quiet time to think and focus the mind toward a greater goal. Oh...and music composition is damned difficult when there are wubs shaking your house. Asking nicely never seems to get her anywhere, so Octavia takes matters into her own hooves.

Sadly, this is only the first step in a great game of chess, and the resulting prank war proceeds to break all rules of conflict in an effort to save face and earn payback. There are no limits, no boundaries, and no song or solo too sacred to interrupt -- because silence is golden, but duct tape is silver.

A Christmas present for Rattletcat that got completely out of control. Tagged for sex due to humor content, not to any actions taken in this story.

Written by 'red Sage

Featured 10/14/2014, and I didn't even have to trade blood for it! Oh, and to whoever found this story by searching 'tape+mouth' as the query, that's not what it's about, you sick freak.

Something I just couldn't get off my mind until I wrote it down. Be warned: the ponies in these battles really go off on each other. Almost exactly like it is in "Epic Rap Battles of History", except with less cursing. There's plenty of verbal bashing, though.

Vinyl Scratch is the DJ for most of these battles, and will be doing the all-caps commentary (except for the ones she's in, of course). OC tag because of slight self-insert.

I've heard that this story is better when read with someone else. You know, with each person doing one half of the rap battle?

List of Rap Battles (as per request)
#1: Twilight Sparkle vs. Rainbow Dash
#2: Pinkie Pie vs. Rarity
#3: Spa Sisters vs. Flim Flam Brothers
#4: Octavia vs. Vinyl Scratch
#5: Angel vs. Gummy
#6: Derpy Hooves (Ditzy Doo?) vs. Lyra Heartstrings
#7: Princess Luna vs. Discord
#8: Scootaloo vs. Pipsqueak
#9: Fluttershy vs. Screwball
#10: Apple Bloom vs. Diamond Tiara
#11: Trixie vs. Featherweight
#12: Silver Spoon vs. Spike
#13: Sweetie Belle vs. Queen Chrysalis
#14: Applejack vs. Carrot Top
#15: Bon-Bon vs. Lyra Heartstrings
#16: Twilight Sparkle vs. Rainbow Dash (rematch!)
#17: Big Macintosh vs. Shining Armor
#18: Iron Will vs. Photo Finish
#19: Gilda vs. Prince Blueblood
#20: Nightmare Moon vs. the Doctor (Doctor Whooves)
#21: Princess Celestia vs. Princess Luna
#22: Snips and Snails vs. Twist and Ruby Pinch
#23: Braeburn vs. Soarin'
#24: Zecora vs. Cheerilee
#25: Winona vs. Opalescence
#26: Derpy Hooves vs. Pinkie Pie
#27: Spitfire vs. Daring Do
#28: Princess Cadence vs. Queen Chrysalis
#29: Babs Seed vs. Lightning Dust
#30: Sunset Shimmer vs. Trixie *
#31: tba

Picture by Silversnow here on this site.

...should there be a 'sex' tag, considering some of the stuff brought up in the rap battles?

Sequel: Left Behind: Sunny Disposition
Apparently it was scouted and is on EqD too

Nightmare Moon was meant to be released after a thousand years. A momentous occasion for her but terrifying for all the ponies on her day of freedom. She would get revenge on her sister and cover the world in darkness and shape everything to fit it.

That was the plan, at least. Instead, something went awry with the spell and she wasn't released when she was supposed to be. The mare-in-the-moon is brought into a world with stagnated technology, giant cities, and no sign of her sister or any of the other immortals. In fact, ponies don't seem terrified of her at all, and the stay within the core of her powers infused and changed the alicorn's body drastically.

The alicorn had no obstacles left! But...she was also a relic of the past. A past everyone seemed to have forgotten. A past she could no longer look upon.

Artwork by ElkaArt. Link in source.
Big thanks to Kryostase for helping spot errors I've missed.

Fifteen years have passed since Littlepip brought peace to Equestria. But now, the clouds of a civil war loom on the horizon. Relations between the Grand Pegasus Enclave and a group of outcasts known as the Dashites are beginning to deteriorate. Fluttershy must find a way to mend the rift before all out war once again consumes Equestria. Enlisting the help of Airborne, one of the few Dashites roaming the Equestrian Wasteland, to solve the age old mystery of what Rainbow Dash's final fate. She hopes that if this question can be answered it might end the conflict before it begins. Airborne now has the task of preserving the dearly bought peace by finding out what happened to the greatest Pegasus in Equestria's history In order to do so he must travel through Equestria to uncover the what happened to Rainbow Dash after the Last Day. Failure is not an option.

Edited by Marlow.
Formatted by Tetragrammaton.
Cover art by Turtledude.

Two months have changed Airborne's life forever. He uncovered the final fate of Rainbow Dash, who was sealed in a crystal tomb for two hundred years. Now he must journey across the Equestrian Wasteland and find out what happened to the greatest team of fliers in Equestria's history the Wonderbolts. But time is running out as a new threat looms on the horizon, Airborne must travel to the blasted ruins of one of the first cities to fall in the War that shaped Equestria's fate forever and uncover what happened to the Wonderbolts as both toxic wind and abundant enemies close in for the kill. Will Airborne be able to finally find the Wonderbolts or will they forever be lost to the Equestrian Wastes? In a race against time itself Airborne must find out the whether this mystery has an answer once and for all.

Cover art by Turtledude.

When A Lone New Canterlot Republic Soldier finds The Mane Six in the desolate wasteland of Equestria, 400 years after the Mega-spells dropped, he takes it upon himself to get them home, and possibly, Prevent the war, whatever the costs.

*Note* Rated Teen for Sexual themes, drug abuse, Gore, and some language. Takes place around 400 years after the Mega spells, 200 years after the stories of Blackjack, and LittlePip.

*Update* The Finale is here, along with a sneak peek to the next book. Enjoy.