[Complete! With TVTropes apparently!]
Also, apparently, an animated trailer.

In a world of brass and steam, Twilight Sparkle had thought she had made a life-changing discovery with the invention of the telescope. For better or worse, she was correct.

Now her discovery has not only changed her life, but the lives of those she seeks out in her desperate attempt to contact the only other creature as lonely as Twilight herself.

It all would have been much simpler, but it had to be the one Twilight could only call The Mare on the Moon.

Decidedly not within walking distance, then.

[Featured on EQD before story was meant to be submitted. 4/03/2015]

[Editing team: Southpaw, Wolfvenom, Maskedferret, SwanSong and BluePaladin42, without whom this story would be a fraction of its current state.]
[Special thanks to Novel-Idea for the updated cover]

This story is a sequel to The Cadenza Prophecies

Princess Flurry Heart inherited her mother's beauty and grace as well as her father's strength and bravery. The Empire couldn't hope for a better or more suitable heir to the Crystal Throne. Everypony in Equestria admires her and thinks she will be an ideal ruler.

They're wrong.

Young Flurry Heart has no interest at all in being a prim and proper princess, and would much rather have wild and dangerous adventures like her Aunt Twilight.

Book 5 of the Alicorn Adventure series.

Equestria is a land of magic and harmony, a peaceful realm ruled by immortal and benevolent monarchs. At what cost is this possible?

Following the discovery of a strange and powerful device, Twilight Sparkle is whisked away to the edges of a land she thought she knew so well. Here, surrounded by ponies whose very existences have been kept secret, she must contend with vicious enemies, hostile allies, and the truth.

Chapters 1-16 edited by KiltedKey

After being marooned on an icy world in unexplored space, Lumina must now face the perils of this frozen wasteland and search for some way home. But in this dark place, she discovers something that was lost to pony kind ever since the fabled Equestria sank into the ocean over 10,000 years ago. Something that will change her, and possibly the entire galaxy, forever.

Not a cross over, and not an alternate universe. This is the far future, and this has happened before.
Cover art by CSImadmax

Now in the FimFiction Gold Archives!
Now on Equestria Daily!
Now featured in Fort-Book Reviews!

Twilight is invited to Canterlot to compete with some of the greatest magicians in the world for the Moonstone Cup, a prestigious award for the most powerful and skillful magicians, unicorn and otherwise. Can she win? What sort of competition will she face?

Awesome cover image was taken from NoOneBahtim

Isolated from her friends and taken prisoner in the middle of a war, Twilight must deal with the very real dangers of being percieved as an enemy as well as the nightmares of her arrival on 'Earth'. Can she overcome her own fears and the fears of her captors? Will the wayward unicorn's assistance be a boon or a curse to the 'humans?' Most importantly, will she ever find her way home?

"In short, it's a story of friendship and plasma rifles, with the emphasis on the friendship. The characters are well written, the XCOM setting is fleshed out very well, and the story is compelling. If you love XCOM, you'll love the story, but even if you've never heard of it, it's more than worth giving the first 3 chapters a read.

There's excellent action later on, but the real strength lies in the collision between the friendly and naive world of Twilight Sparkle and the desperate world of humans fighting a losing war for survival and willing to do anything to turn the tide."

--Arzoo

(XCOM/FiM crossover)
(Cover art commissioned by a friend and created by the magnificent FoxInShadow!)
(Original cover art by the amazing Carnelian can be viewed here!)
(Gore tag for blood and some violence)
(Many thanks to the studius OminousTen, Arzoo, xXFluttershyForeverXx and finally Setokaiva for giving my rambles a once-over)
(Now with it's own TV Tropes page! Get to tropin' folks!)

"To him, I was a way to reconcile his duty with his conscience. To me... he was someone to talk to at a time when I had no-one." -- Princess Celestia

Lord Ragnarok, newly crowned King of the dragons, stands upon a hill overlooking the country of Equestria, an army at his command. Princess Celestia is urgently roused from sleep with a dire warning of impending attack. Thus begins a chain of events that would bring together two of the most powerful rulers of the age, and forge the unlikeliest of bonds. One that would bring salvation to one, and solace to the other.

"I won't call him an enemy, and he won't call me a friend. Make of that what you will."

A precursor / companion piece to Eclipse.

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

"Thanks, Mom." Two simple words said by a simple guard.

Not so simple when those words are accidentally addressed to Princess Celestia.

This story is a sequel to Beauty Will Tear Us Apart

There is another secret agent stationed in Ponyville.

Some elder siblings are not as old as they look.

Ponyville's premiere party planner is pondering her purpose.

The world is not quite what it seems. A pony, in the wrong place at the wrong time, just might stumble behind the stage and see the the nuts and bolts that hold their reality together. Some ponies brush up against the dividing curtain briefly and never understand what it is they saw. Some ponies get a good, long look behind it, and their lives are never the same. And some ponies live their whole lives with a hoof on each side.

These are their stories.

The comment section may contain unmarked spoilers.

Cover art by the multi-talented KuroiTsubasaTenshi.

Big thanks to my pre-readers (in roughly chronological order):
cleverpun
Midnight Rambler
Justanotherbrony
KuroiTsubasaTenshi
war877
JapaneseTeeth

Look at this guy who said something about this, one time.
And also this guy.