My main go-to resource is https://www.reddit.com/r/TrackersInfo/wiki/official_recruitments.
They are pretty hard to get into. Not much official recruitment and invites are relatively hard for users to get. IMHO they aren't really worth it for how hard it is to get in. The tracker is also a bit weird and I don't personally find it is for the best. However they are home of HONE and one of the few places where you can find 1080p WEB-DL with modern codecs. So I would be lying if I said I didn't use my account there.