Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

This story is a sequel to Scion of Chaos

After returning to Ponyville from Canterlot, Sweetie Belle tries her best to find her place amongst friends and family and to remember what it feels like to be home.

This story takes place 4 days after the finale of Scion of Chaos. (I recommend reading that first, if you haven't already)
And set 5 years later is the sequel story: A Heart of Change

Thanks to Rameslack for his amazing cover art.

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

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 -

In the aftermath of one of Pinkie's parties, an innocent query leads Dash to question why she's still living with Pinkie Pie. Why does she feel trapped when there's nothing holding her back?

And how many buildings can Pinkie Pie destroy before insurance companies stop covering 'acts of Pinkie Collateral Damage Pie'?

This story is an indirect sequel related to Where Earth Meets Sky, but can be read just fine on its own. It simply assumes a previously established relationship.

Something is definitively up around here. Applejack and Fluttershy have been spending a lot of time together without the rest of the gang. Well, Rainbow Dash is on to them! In fact, she is sure this is the no-good friend-stealing Applejack's doing, and she will not stand for this - whatever this is.

Also, Rainbow Dash wears a corn hat.

This story is a sequel to Awakening

This is the long dark night of the soul. More than 10,000 years have passed since Celestia’s reign over Equestria ended and the entire continent sank into the ocean and faded into myth and legend. Although the pony tribes have colonized the stars, the earth ponies have lost their connection to the land, the unicorns no longer think magic even exists, and the pegasus tribe has forgotten how to fly.
Although the principles of magic and friendship and Harmony are under constant assault in this age of war and strife, a pegasus named Thunder Gale has travelled to the ends of the galaxy in search of a long, lost friend of his. His search has led him to a planet where the old ways have not been entirely forgotten and evils left dormant since Celestia’s time stir once again. In order to survive the night, he’ll have to seek out guidance in the last place he ever thought of looking: the wings on his back.
Not a crossover nor an alternate universe, this is the far future and all this has happened before, and will happen again.
Cover art by Silfoe.
Now featured on Equestria Daily!

This story is a sequel to Our Chaotic Melancholy

Eve, a baby draconequus shunned by equestrian society, continues her ventures in the hopes of finding a path to the life she craves. A life of peace, love, and acceptance.

But the further she goes, the more she begins to question whether her dreams were ever possible. And the further her cherished world becomes, the more she begins to question her destined role as a draconequus, and a monster.

When a lone baby draconequus happens to stumble into Cheerilee's class one day, the caring mare can't help but take it upon herself to attempt raising it.

But as time goes on, Cheerilee soon learns the risks of taking in a draconequus. Risks, that could cost the both of them, everything.

(Much loved Editor: The11thWonder, + Revision Chapters 9 & 10: Jokie155)

Be Awed and Amazed by the tale of Sweetie Belle as she traverses the multiverse in search of her lost mentor and friend, Twilight Sparkle! Will she find her in post-apocalyptic Equestria? Or maybe in a strange world where everypony is the wrong gender? Or even where a Pony claims to be a human? Read as she journeys through very familiar worlds you might have read about... if you dare!

At this point in time all the main worlds to be visited have already been chosen. Thank you all for the suggestions, and I hope you enjoy the surprises!

Here's the official TSC:F Music Intro: The Sweetie Chronicles: Fragments

WDTP: S2/3-CE
You can also visit the TV Tropes Page which has spoilers!