HPMOR – Harry Potter and the Methods of Rationality, by Eliezer Yudkowsky -The greatest. The funniest and most philosophically moving and educational story I’ve ever read.
Find other Eliezer Yudkowsky fiction at http://www.yudkowsky.net/other/fiction/. I recommend The Sword of Good, and Three Worlds Collide, especially.
The Last Christmas, by Alexander Wales – We use this story as an example of how other minds might find something other than morality moving, in this case, the elves and their Christmas Spirit.
Find other Alexander Wales fiction at http://alexanderwales.com/.
Unsong, by Scott Alexander – Puns.
Rationalfiction, a compilation of works of “rational fiction.” I recommend Mother of Learning.