Steins;Gate, a Japanese light novel and anime, includes John Titor in the story in an awesome way. It also includes some bit of hacker culture that I think is more real than the typical American movie "hacker". I recommend it!
Edit: As pointed out in the comments, this was originally a visual novel! There are many ways to enjoy this story.
Edit: As pointed out in the comments, this was originally a visual novel! There are many ways to enjoy this story.