Nighttide Star, born under the moon of a foreign land, is adopted by the Daedalus Institute of Research and Exploration when her parents are killed in an earthquake. Raised under the company's Labyrinth project, she is hoof-picked for a leading – and as of yet untitled – role for the government. Branded with the serial number LAB-1032, she is all but pure machinery by the age of eighteen.

While running an experiment on a prototype warp drive, Nighttide is lost to the ether and wakes to find herself in Equestria. Lost and injured, she is discovered by a timid mare with wings, and soon embarks on an unexpected journey.

Rated Teen for mild language, violence, and blood
Takes place midway through S4 of FiM
Character redesign and chapter illustrations by GloomyMark Goombot Cosmalumi

In the magical land of Equestria, two alicorn sisters raise the Sun and the Moon every day to give the world a night and day cycle, basic for the survival of life. There are also two alicorns who rule over two very core aspects of life and harmony itself. Those are Love and Friendship. While not as ancient as the two sisters, all princesses are essential to the world's balance.
This balance is also sustained by the hard-working ponies, who make the seasons change and manage the weather to fit their needs, so everypony has enough food and water, and every animal is also attended to assure that any of them are caught in the changes of seasons.

But what about the planet itself? What about Mother Nature?
This is the question that Gaia asks when she arrives to this foreign world. After so much work her son persuaded her to take a long vacation in Equestria, saying that she needed one and assuring her that he would be in charge now, and she must take a break. But what can a several billion-year old alicorn possibly do to pass her time in this land?

(SimEarth/MLP Crossover)
(Timelife of Gaia's life 'till the start of the story)

Ponyville, Equestria. Population 5000.

Fallow Meadows, Indiana. Population 8000.

Two towns, two species, two worlds.

But worlds will collide when both are hit by mysterious storms that transport them to a third world unknown to either. Trapped in a place hostile to them both, can human and pony learn to work together? Well, yeah, the story wouldn't be called Unity otherwise.

The real question is what happens when it turns out that they are not alone...

A machine made for war awakes in a new world. Stuck in surroundings which puzzle it; can it, or will it be able to become something more than what it is?

Crossover with Keith Laumers Bolo-verse
Other tags include : Slice of Life, Possible Romance believe it or not! And a bit of humor.
Please beware of any spoilers in comments as well

If there's one thing we can count on, it's Twilight Sparkle, prized student and newest princess, to botch up a spell in her quest to master all of magic.

This time, it propels her to a new world, this one not inhabited by bipeds, but ponies like herself, and yet not like herself. She has entered the realm of Everglow, where the queen is a queen, and ponies suffer horribly lethal combat much more often than Equestria could manage under the peaceful reign of its alicorn caretakers.

Will she find her way back home, to her friends and responsibilities? Will she survive the harsh new realm she has entered?

Based on Ponyfinder. Want to support the author? Check out his Patreon.