Boxtorrents is a tracker that specializes in anime content so fans of the genre will no doubt love this tracker. First thing i noticed about this tracker is its large user base. At time of this post there are 118,754 members on this tracker which is relatively high for a private tracker. They have nearly 4000 tracked and most of the torrents are bound to have a longer life span due to the high user base. They are open for signup and it is a must have if you are an Anime fan.
Site Name: Box Torrents
Signup URL: http://www.boxtorrents.com/signup.php