Spartans never die, they're just missing in action. This has never been more true for Jorge-052 as, after activating the slipspace drive that was supposed to kill him, he is instead flung into a strange world where war is but a distant memory. Will the aging soldier be able to adapt to this new peaceful planet? Or will his only salvation be found in finding a way back to his own chaotic universe?

(It's my first time, so be gentle)
Now featuring a TVTropes page by Sabo88

After a run in with the Flim Flam brothers, Applejack and her family end up taking in the robotic stallion Big Lugnut. Big Lugnut denies all claims that he is a robot despite Applejack's constant persistence on the matter. This story chronicles the moments of tears and laughter during his exploits in and around Ponyville.

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

After Chrysalis failed to conquer Equestria, she was shamefully stripped of her title of "Queen of the Changelings".

Their people now leaderless, the Changeling race now finds itself in a unique situation. In the struggle for power, one Changeling seizes the attention of his people. Can he overcome his nature, and the nature of his people, to lead them into a better future?

Applejack finds a strange visitor in her apple orchard one day, with even stranger stories to tell...
MLP/L4D2 crossover. My first story on FiMfiction.net! May add more tags as story progresses.
Credit for the image goes to brokencreation on DeviantArt.