Diablo Crossover.

The Archangel of Justice destroyed the Worldstone to spare Humanity the corruption Baal infected it with. The force of its death knell shatters Mount Arreat and sends Tyrael hurtling across the endless planes of reality. He falls upon a world untouched by Angel or Demon, far from the sight of the High Heavens. So far, in fact, that he fears he will not be reborn from the Crystal Arch.

Wounded and near death, hope appears in the form of two strange creatures bearing the power of night and day.

Tyrael now faces a time of recovery as his power slowly heals within a body fashioned for him by his saviours. Justice Incarnate tastes for the first time the life of a mortal, and it is a strange, confusing experience .He has been left in the care of one Twilight Sparkle to learn of this world.

After all, where better to find peace and harmony than Ponyville?

Act I - The Root of Evil
Act II - ????????
Act III - ???????
Act IV - ???????

[Cover image used with full permission of the owner. Go on, go have a look at Chagial's stuff.]

What would you do, if you met a pony who was at once your brother, and yet not? Applebuck wishes to reunite with his 'Cousin JayJay', and braves the dimensional divide to reach his goal. But being a small foal, how will he deal with a world in which everything is flipped? His friends, his family, and even... himself?

It is the year 2038, and the Earth is slowly being consumed by a space-borne monstrosity dubbed the Black Tide, which is using nanotechnology to remake the planet into something hideously alien.

Erin Olsen works for Project Harmonics, humanity's last-ditch effort to find a new world before the Tide can wipe them out. But when that world is found, and it turns out to be occupied, Erin will need to find the courage to face the unknown in order to save the inhabitants of both worlds.

(Many thanks to Easteu for the fantastic cover image for this story!)

Now with its own TV Tropes page

There is now a follow-up to this story: Sunflower - Side Projects
Sequel: Project Sunflower: Harmony

What are the chances your favorite pony was secretly a changeling all along?

Yeah, probably about one in one.

Ace was a street magician with a lucky streak. His luck was legendary among casino owners and fellow magicians. Any risky trick would succeed flawlessly and any gamble would pay off for him.

After performing his greatest and final trick he is brought face to face with the entity responsible for his incredible luck. The goddess of fortune herself. Lady Luck.

She offers him a deal. To become her champion, her Wild Card, and go to Equestria to spread luck among those who need it the most. So he finds himself in a magical land, in a new form, and ready for anything that comes at him. To a reasonable degree.

(Part of the Chess Game of the Gods universe created by Rust and BlackWing)
(Cover art by Grusborg on deviantART)

The Eleventh Doctor (aka Matt Smith) is bumbling about in his Tardis when a crazy timey-wimey happening finds him in Equestria, a land from a children's cartoon. Despite the idea that being in the world of TV ought to be impossible, he's found himself turned into a bowtie-wearing pony in a pleasant little town known as Ponyville. What's more, the people there won't stop calling him Doctor Whooves! In order to get bet back into his own Time Lord form and out of the impossible world of My Little Pony, he may or may not have to make some new friends, fight some villains and pull out his "savior of the universe act." Geronimo!

This is a different take on Doctor Whooves, and also a sleep-deprived Doctor Who/MLP crossover idea I got in the very early hours of the morning so it could easily be rubbish. It's not meant to be terribly serious, but it's also my first fic so go easy on me. More characters could come and the rating could possibly change.

Fantastic, I finally get to visit my favorite cast of awesome talking ponies to have one small thing keeping me from enjoying it to its fullest. I CAN"T FREAKING INTERACT WITH ANYTHING. I guess being a ghost in Equestria isn't the worst thing that could have happened, at least I can shadow my favorite ponies and see what going on in their lives. Heh, I guess I've become the ultimate stalker, I do miss having someone to talk to that wasn't me, myself or I though.

*^*^*
Set before the events of season three.

Rated teen for now for safety, rating may change later on based on where the story goes. Characters will be added later if they get added to the story.

Note: The rewriting has started!
Magnus is the sole survivor of a colony ship headed towards Betelgeuse. The ship gets thrown off course when a huge asteroid slams into the ship, which is then pulled into a black hole.

When the ship exits on the other side, he finds himself alone and in an unfamiliar shape. His only companion, an advanced A.I named Ana keeps him slightly sane during their six thousand year voyage through unknown space in a nearly derelict ship.

Everything changes when they find a small blue planet teeming with life.

The old version can be found here: Link

Editing by: Lab
All art by: Mister Aibo, DeviantArt, Fimfiction Profile

The last thing you remember was being blown out a hole in the side of a crashing star cruiser, catching fire in the upper atmosphere and falling to your death upon an alien world below, yet there you are, whole and mostly unscathed and without a clue how you got there. But just because you survived the crash, it doesn't mean you're anywhere near out of the woods yet. With nothing but your power armor, rifle and wits to guide you, can you survive the depths of the swamps and forests of Everfree? And even if so, what about beyond?

[Second Person POV] [Sci-Fi]

It is the year 3070, and Mankind is once again at war. The battlefields of the future are dominated by fierce, robotic war machines known as BattleMechs, and under their auspice empires have risen and fell. Now with the worlds of the Inner Sphere once again facing the drums of war, two mercenary units have set off on their respective missions, their only tie a common ride upon the back of a JumpShip.

Yet when a cosmic accident causes a misjump, they find themselves thrown into a world that they cannot fathom: a world where magic is a force of nature, where mythical creatures live and thrive, and colorful ponies live protected under the aegis of their monarchs. New choices lie ahead, decisions must be made, and the inner character of Humankind will be put to the test when the question is asked: to conquer, or protect?

--------

It is the year 1023 after the ascension of Celestia and Luna to the dual thrones of Equestria, and Ponykind is at peace. With Luna cleansed and Discord sealed away even more thoroughly than before, all looks bright for the future of the colorful equines. With friendship and optimism, they face each day with hope and vigor.

Yet, when the heavens scream as a foreign object tears its way into their reality, the princesses and their subjects face a new threat that they cannot fathom: creatures and machines from a world of death and darkness, where magic is unheard of and the avarice of powerful men drive the engines of war to crush the innocent under their bootheels. Can they survive the coming of these coarse beings, and can they maintain the magic of friendship in the face of Man's Inhumanity?

With Russian Translation provided by Undermind.

A crossover with the Battletech universe, though this is an alternate BT timeline of my own devising. [WARNING: Fandom related material and fanboy rant to follow. Non-Battletech fans won't care, read at your own risk.]

Because **** the Word of Blake and their munch-tastic "armies from thin air" BS. Yes, I know the Clans were almost as bad, but at least they had some sort of justification in-universe. Wobbies? No. Just no. I don't care that it was 15 years, you don't go from "fringe group of mutually-antagonistic and argumentative sub-groups following various degrees of religious mania" to "WE ARE THE SPACE NAZIS ALL WILL BOW BEFORE US" like that.

So for BT fans, this is a 'verse where the Second Star League is still around, the Wobbies still had their temper tantrum though it was smaller and more in line with a bunch of religious fanatics. No stupid "knock everything down for ClickyTech" Wizkids/Fanpro approach, nor any "hey let's shove a bunch of cheesy Level 3 stuff at the players to make the game even more complicated" Catalyst Games stuff. This is just good ol' fashioned 'Mechs wailing on each other, only with ponies. Who will also be wailing on 'Mechs. GLORIOUS.

Cover image by Icaron of DeviantArt.