1) AnimeBytes: This is the best anime tracker out there. Everything is allowed but sometimes bad releases are better seeded than good ones, 1080p releases are always freeleech and it's easy to maintain ratio. Unfortunately it's very hard to get into right now!

2) BakaBT: This is the 2nd best anime tracker after AB despite having a long blacklist (do not upload list). Building & maintaining ratio is harder than AB. Right now, they're open through IRC interviews.
This is a unique tracker:

- Only completed anime is allowed. Airing anime is not allowed.
- They ban licensed anime, which is a big minus
- Almost everything is well-seeded and there are no dead torrents there
- They are the best for old school anime. Some stuff can't be found nowhere else.
- Usually, they only allow 1 fansub group per resolution (1 release for 480p, 1 release for 720p...etc). In other words, their staff chooses the “best version” for you, but sometimes you won't like their choices!

3) AnimeTorrents: This is a decent tracker, maintaining ratio is easy since 1080p are always freeleech, and it's easy to get into! You may find about 60 to 80% of what you're looking for, but with medium to low speeds most of the time. Their retention is not good because old torrents die quite often.