Reddit reviews The Tragedy of Prince Hamlet and the Philosopher's Stone, or, A Will Most Incorrect to Heaven by William Shakespeare

I know there is Luminosity, a Twilight fanfic. This was specifically inspired by HPMOR, as far as I know.

And someone from this community started writing a Pokémon fanfic.

Friendship is Optimal is also frequently mentioned in the same breath as HPMOR, but I don't know if it was inspired by it. It's not true fanfic, in that it doesn't really use any of the original characters or even the actual universe of the source material. It's still pretty good, though.

And as always in these conversations, I'd like to point out that Rational!Animorphs would be really cool and probably lends itself to this genre quite a lot. The only real hurdle to overcome is figuring out Z-space. ^(I'd do it myself, but I'm not a good writer.)

Edit: Since this is the top-rated comment, I'm going to update based on what others have said.

There's also Lighting Up the Dark, a Rational!Naruto fanfic that is explicitly based on an HPMOR omake.

And then there's Rationalising Death, a Death Note fanfic.

Edit 2: Hamlet and the Philosopher's Stone which is touched on in one of the omakes. Unlike the others, you have to pay for this one.

Everyone seems to have forgotten about Hamlet and the Philosopher's Stone, probably neglected just because it's behind a paywall. One of my personal favorites out of the rational!fic literature! There's more about it here.

Also, some thoughts, mods: Can we add a "other Rationalist Fics" section to the sidebar, or maybe a wiki page with a link there? We'd include the other MoR-verse fics, the other rational!fics, and the Sequences, as a nice neat little resource for people who want more. That way, we won't have the need for so many redundant threads. And when they start a new fic, authors can PM the mods! Whatdya think?