Trapped in time for a thousand years, the Crystal Empire's return brought with it a power far more dangerous than King Sombra: Knowledge.

yeah...an American Dad crossover

Stan and Klaus enter together in the annual Canterlot Intelligence Agency talent show but when Roger feels rejected he takes matters into his own "hands".

Who would really win in a fight between Celestia and Luna?
No buildup, no plot, just a simple, epic fight between our two favorite goddesses.

Pretty self-explanatory

This is a sequel to Doctor Whooves and the Other Doctor read it at: http://www.fimfiction.net/story/7397/Doctor-Whooves-and-the-Other-Doctor

Two months after being visited by the humanoid Doctor, Dr Whooves had been both blessed and cursed with dreams of The Doctor. In his dreams he relives his past memories and the events that led to him giving up on who he was. The dreams come in random fragments and he tries to piece them together without losing his own identity.

Now a rainbow's tale isn't quite as nice as the story we knew of sugar and spice.
But a rainbow's easy once you get to know it with the help of the magic of a pegasus device.

We all know the story of the Rainbow Factory, of how Rainbow Dash had gone mad and done unspeakable horrors. But how did it all come to that? How was it that Rainbow Dash, known for her loyalty, descended into such madness? This is Rainbow Dash's story of losing herself to that dreaded factory, for as we all know, in the rainbow factory not a single soul gets through.

This is a prequel to 'Rainbow Factory' by Aurora Dawn: https://docs.google.com/document/d/1td5r9BGGA7l2-rnlFTnVrJN2NdZclcVWUMoCqaSujnM/edit?hl=en_GB

which was based on the song 'Rainbow Factory' by WoodenToaster: http://www.youtube.com/watch?v=YRx_iXgLAyw

Not your typical Doctor Whooves fanfic. A series of events cause the TARDIS to blast into a dimension populated by (you guessed it) ponies and (of course) crashes. While waiting for the TARDIS to repair itself The Doctor runs across a certain brown stallion, whom he will discover is a reflection of himself in more ways than one.

But even after The Doctor was gone his mere presence created a ripple that would awaken an ancient being. Continued in the sequel http://www.fimfiction.net/story/15733/Doctor-Whooves-and-the-Sea-of-Dreams

In a dark future where Princess Celestia and Luna are nowhere in sight, Pinkie Pie takes it upon herself to rule Equestria. Waging a party war against party crashing griffins she finds herself cornered with no other option but to go back in time using her 4th wall breaking powers to meet her past self. Using strengthened ability to break the 4th wall Pinkie Pie travels the multiverse and delves into fanfics written by much better authors to gather an army of Pinkie Pies to throw the ultimate party against the oncoming horde of party crashing griffins. First chapter doesn't really have much of alter universes or crossovers but there will be lots of that later on if I decide to keep going with this pet writing project.

P.S. if you catch some of the references I make in this then you my friend are awesome