SG-1 is sent through the Stargate as a forward scouting team for an extended scientific mission to P3X-597. Arriving in a long abandoned castle, the team heads out for the nearest village. As they approach, it becomes clear that the locals aren't exactly human. Their contact with the pony-like aliens goes well, conveniently timed alongside a celebration of the sun, until an over-the-top, hammy, evil pony appears to ruin the festivities.

A Stargate SG-1 crossover.

Pinkie Pie throws excellent parties. This is a fact of life, like Fluttershy being rather demure, or Rarity having a sense of style. But the fact is, Pinkie's parties cost bits, and her job at the bakery isn't supporting her passions anymore. So she dusts off her degree and opens a side business...

[Wrote this before DS3, ending is probably not canon, but I had to modify the canon to integrate ponies into the storyline]
It is 2508. The USM Valor is armed and authorized to "rescue" USG Ishimura from the grasp of the Marker. Numerous cases of dementia start to appear in the crew members of the Valor along the journey to the Aegis system, especially in the Marine veterans onboard who have survived the horrors of the Resource Wars and colonial insurrections.

Meanwhile, across the universe, the Royal Sisters of Equestria funded a project to seek other sentient beings in the universe that have been directed along a path of havoc and destruction by Discord. Pinkie Pie, one of the "early-detection" staff, is accidentally transported onto the USM Valor around the time the destroyer's crew begins to experience its final moments, as they find something extremely foreign in one of Ishimura's escape pods....

One of the military personnel that had been deemed a Section 8 onboard the Valor soon narrowly escapes his demise, and, skating on the thin ice of his already broken sanity, meets the aformentioned pink pony in the blood-drenched decks of the crippled Valor.

To join is to survive, and in pieces we scatter.

BTW, it's a non-Isaac Clarke perspective

Sweetie Belle is compelled to learn magic after Rarity promises to teach her the finer art of dressmaking, but only once the young filly has learned the basics of magic. However, learning magic comes with its own set of complications and bears an unforeseen gift that will change Sweetie Belle's life forever.

Here's a one-shot sequel that takes place four days after Scion of Chaos: An Emerald Treasure

And this is a Multi-chapter sequel that takes place 5 years after the events of SoC and AET: A Heart of Change

Here's a poem that's based around the character Red Timber. (Not necessary to read for the comprehension of the storyline): Red Timber

Special thanks to SameAsUsual for letting me use his art: http://sameasusual.deviantart.com/art/Ultimate-Sweetie-Belle-340226445. And to ShadowBro for adding in the title and cropping the image.

Celestia is dying. Or at least it seems so. Afflicted with a curse that is destroying her very nature, she sets a plan in action.
The Bearers of the Elements of Harmony will take the throne in her wake... Not that they know that yet...

(Takes place as an Alternate Season 3)

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

Meet Cyr. He's one of the last of his breed: A Changeling Behemoth, living battering rams that are selected and mutated from the worker caste of the Hive. Aged from centuries of labor and service to his Queen, he grows disgusted and weary of the Changeling's plots and malevolent attempts to feed on love, especially after his capture during the Canterlot wedding. Thus begins a new (and possibly more enjoyable) chapter of his existence.

Ambushed. Defeated. Broken. Banished from his world, he expected his story to end, his revenge unfulfilled. Instead, he found himself in a new world - a world of peace, tranquility, and harmony.

May God help them.

For as long as Rainbow Dash could remember, her life was simple, straightforward, and planned out with one goal in mind: become the best flyer in all of Equestria. Simple. But when she unwittingly comes across a tool that allows her to relive the memories of her ancestors, that simplicity is challenged when she discovers dark secrets hidden in her family's past as well as Equestria's history that not only challenge her perceptions of reality, but threatens to alter her very psyche.

As she's thrust into the remnants of a centuries-long war, as she questions the morals of those around her, as she battles to separate reality from fantasy, will Rainbow be able to hold on to her own beliefs or will she embrace her family's blood-stained traditions and finish what they started?

Okay, I don't know if anyone can hear this, or read this, or whatever, but I'm trying my best to use Pinkie Pie's legendary fourth-wall-breaking powers to try and get a message out.

If you can hear this, I need help. I'm in Equestria, and man, this is strange. But I'm also stuck in Pinkie Pie's body, for some reason.

Yes, it's just as weird as it sounds. And now, I need your help... because all the ponies in this town think I'm crazy!