A canon part of the PonyEarthVerse.
Added to Twilight's Library on 12/4/2014.

I knew I should've called in today. I wasn't sick, but at least I would've avoided all of this mess. One moment I was making myself comfortable during my lunch break for some off the clock zzz's; the next, I'm a blue stallion background pony trapped in a kennel and robbed of my personal effects.

You say you've heard this song before? Care to hum me a few bars?

EDIT: Awesome new cover provided by JazzyQ
Extra Character Tag: Batpony.

Well, it finally happened. I've gone crazy. Go to sleep after finishing up some homework, and wake up as a fan-character from something called 'My Little Pony'. God help me.

Yet another TF2 crossover! Coverart doesn't belong to me.

Everything changes for Twilight Sparkle and her friends when a mysterious extraterrestrial ship crash lands in Equestria. When Twilight messes around in the ship's systems with her magic, she ends up transported to an alien world unlike anything she imagined: a box canyon in the middle of nowhere.

To get home, Twilight must enlist the help of the eccentric Red and Blue soldiers that live there... if she can get them to stop bickering first! Additionally, she finds herself being pursued by the enigmatic military agency known only as Project Freelancer. Back in Equestria, all is not well for Twilight's friends as forces involved with the crashed ship make themselves known. Reds, Blues and ponies will all have to work together to discover the mysterious connection between Equestria and Project Freelancer.

A crossover with Red vs Blue. Written with the intention for the story to be followable without having watched the series. (just don't expect to get all the references).

Now with editors! BradtheBrony and Rough_Draft.

I made a blog post explaining things. You should read it.

TvTropes Page.

The rulers of Equestria have decided to hold a competition that has not been held since before Discord was imprisioned. Follow the Sun team, one of 4 competing in the tournament; as they learn about teamwork and friendship to win the chapionchip.

A crossover with Team Fortress 2.

*POSSIBLE RAINBOW ROCKS/FRIENDSHIP GAMES SPOILERS*

In an alternate take on the ending of Equestria Girls: Rainbow Rocks, Sunset Shimmer gains a pair of wings, she and Twilight realizing she's become an alicorn. But more has happened now. Because of Sunset Shimmer's ascension, magic, once thought non-existent in that world, starts to awaken as more and more gain the ability to use magic. And meanwhile, a shadowy force that once was the servant of a blank-faced nightmare begins to revive...

Takes place in the Waking Nightmares universe, starting two years before it and then with a couple of timeskips to get to the beginning of the Waking Nightmares timeline.

Twilight Sparkle has spent months researching chaos magic, developing a new spell to unlock magic nopony has ever experienced before. But when something goes wrong with casting, Twilight finds herself turned into a Draconequus and unable to control her new chaos magic. If she ever wants to be a pony again, there is only one who can help her learn to control her new magic.

Of course, learning from Discord was never going to be simple. And after a while, being a draconequus doesn't seem so bad anyway....

Based on the concept by Lopoddity

Editing by DB_Explorer
Proofreading by Mac349 (Ch. 1-11), Trippy998, Just A Fabulous Cat (Ch. 1-5), Doctor Candor and skysthelimit (Ch. 1-11).

This story is a sequel to The Irony of Applejack

Warning: this story is a sequel. Therefore, it is highly recommended that you read the prequel first before continuing!

Over half a year has passed since the changeling attack on Ponyville, and Applejack would like to think things have finally settled down. Much has changed for the young changeling, and all of Equestria in kind. The new district in Ponyville proves that, along with the town's many new residents.
But there is much the young queen does not yet know about being a changeling. Some things, she will learn, can be chosen, while others will be chosen for her. With new allies and enemies emerging all around her, Applejack must discover what it truly means to rule before the choice is taken from her forever, and the history of the changelings repeats itself, once again...

Image provided by Heilos.

For most of Applejack's life, she didn't know what she was. True, she understood who she was well enough.
But ponies don't change shapes, nor do they get strength from love.
Applejack never thought too hard on it... until the events of a certain wedding brought about some harsh realizations.
Now, with Equestria still reeling from the surprise attack, will Applejack manage to come to terms with what she is? Will she even be able to keep her secret safe?
For if the royal guards don't get her first, the conspirators in the shadows just might...

Image provided by Heilos -

Second main installment in the Tutelary Spirit universe. Recommended reading order: Loyalty, Honesty, Generosity, Kindness, Laughter, and Friendship.

Many ages after the original adventures of the Elements of Harmony, a hybrid mare crosses the countryside, searching for the Element of Honesty. And just like the rest of her friends, Honesty is no longer just a simple bearer of her Element anymore.

She is her Element.

Cover image belongs to turnipBerry.

I've seen this idea done before, but as a fan of Sonic and MLP: FiM, I wanted to give it a go myself.

This, basically, is the story of Sonic Generations, but crossed over with the MLP:FiM universe, with Spike and the Main Six taking the place of Classic Sonic and Classic Tails with other MLP characters also appearing (most aren't listed to prevent spoilers). Except for Green Hill, there will be different areas explored, as well as pony rivals and different era bosses. So while it will have its similarities to the console and 3DS versions of the actual game, it will definitely have its differences too.

Also, in case anyone was wondering, there will NOT be any shipping in this story. At the very least, no crossover shippings. No SonicxRD, TailsxTwilight, TailsxFluttershy, or anything like that. If there is any shipping at all, it will only be between characters from the same universe. And the only humans in this story are Dr. Eggman and the ones that appear in the "Sonic Unleashed" level.

A big thanks goes to bvge on Deviantart for creating the new logo on the cover art. It's a vast improvement over the old cover art.

The TV Tropes page can be found here.

NOTE: Due to the length of many of the chapters in this story, most of them have been broken up into smaller parts of roughly 10,000 words or less to make the story easier to read.