There are so many of them. Do you have any specific requirements/needs or a function for a site to have so that you'll start using it regularly?
Why do you use the sites that you do?
Requirements: extensive functionality (links to bounty, capacity analysis, brief description of the project) and user-friendly interface. It is also important to take into account the lifetime of the tracker / its popularity, because small trackers are often not objective enough and can intentionally overestimate the project.
Now there are a lot of good trackers. Competition in this area does not leave a chance for bad resources, so you can use almost all of them.