I finished some really good anime, and I can't really find any new ones like them. I don't really like any long ones, it takes too long to finish. Im looking for some less than 40 episodes.
Here are some of my favourite short animes:
Death Note
High School of the Dead
Code Geass (a little bit over 50, but whatever)
Future Diary
Attack On Titan (So far, only 13 episodes)
Bookmarks