Sweetie Belle gets curious about where babies come from, so she confronts Rarity about it.

After being abandoned by her mother in the Everfree forest, Derpy is taken in by the kind earth pony Mary Doo, who tries to do all in her power to unlock Derpy's inner genius from her seemly broken body and mind. As Derpy learns to communicate she also learns the secrets of the world, makes friends, falls in loves, all on her quest to learn to fly so that she may finally accomplish her life long dream and face her face dark past.

This is a spin-off of Bubbles: http://www.equestriadaily.com/2011/03/story-bubbles.html

Fluttershy having been friends with Rainbow Dash for a long time decides to invite her over to discuss something on her mind. As it turns out, Fluttershy really has been longing for a child to take care of, and not just any child, but Rainbow Dash! What follows is a journey of infantilism and regression.

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

When your life is as dull a gray as the world that surrounds you, the mundanities can make it all seem meaningless. Sometimes all we need is a little color -- or six -- to reintroduce us to what truly makes life worth living.

*6-16-2017 Edit, added Rainbow Dash tag because it triggered knighty.*

Derpy Hooves is secretly a changeling.

Nopony particularly notices, or cares.

(New 9/15/19: Spanish translation by Spaniard Kiwi! Thank you!)

"My name is Lyra Heartstrings, and you will not remember me. You won't even remember this conversation. Just like with everypony else I've ever met, everything I do or say will be forgotten. Every letter I've written will appear blank; every piece of evidence I've left behind will end up missing. I'm stuck here in Ponyville because of the same curse that has made me so forgettable. Still, that doesn't stop me from doing the one thing that I love: making music. If my melodies find their way into your heart, then there is still hope for me. If I can't prove that I exist, I can at least prove that my love for each and every one of you exists. Please, listen to my story, my symphony, for it is me."

Cover pic by Spotlight: askspotlight.tumblr.com

The mane six take shelter in a place that is, for now, safe from a disaster occurring outside.

This gruesome tale of violence and death is not recommended for colts, fillies, or the faint of heart.