Open Signups: 4HD Trackers

Name: Seed-bytes

Signup URL: http://www.seed-bytes.com/signup.php

Start bonus : You get 50GB

Total Members  1,845

Torrents 1,545

The speeds are okay but they definitively need more users so the activity increase.

Name: HDahoy

Signup URL: http://hdahoy.org/register.php

Maximum Users: 10,000
Enabled Users: 7,928
Torrents: 2,144

Start bonus: You get 10GB  + 1 invite

Categories are: Movies, TV, Documentaries, Music videos, XXX & Other.

Good amount of seeders here and speeds are not bad at all and they have a seedbonus system in use.

I think this one is the best one of the 4.

Name: Blu-Torrents

Signup URL: http://www.blu-torrents.net/signup.php

Users Registered 3,174

Torrents: 180

Start bonus: You get 100GB 

Speeds are okay but they need more users to increase the activity on the site.

Name: HDspace

Signup URL: http://hd-space.org/account.php

Members: 17177

Torrents: 2394

Start bonus: 2GB

They have a seedbonus system in use witch allways is welcomed on HD trackers especially for users with slow upload speed or bandwidth caps.

Categories: 

Blu-Ray, HD-DVD, Movies 720p, Movies 1080p, HDTV 720p, HDTV 1080p, Doc 720p 

Doc 1080p, Animation 720p, Animation 1080p, HQ Audio, Music Videos, XXX 720p, XXX 1080p  Trailers, Software, Other