I saw Deftones and Incubus a few years ago. It was one of my favorite shows but I don't think either identify as nu metal anymore (definitely not Incubus but they are still amazing).
I loved Powerman 5000, Linkin Park, static-x, Orgy, limp Bizkit, KoRn, fear factory, Disturbed, Mudvayne, and of course System of a Down. Oh yeah, also Poem by Taproot was my song!
I was more into punk but I loved those bands I listed.
Also, shout out to the Queen of the Damned soundtrack because that we immensely better than the movie (well aside from Aaliyah as Queen Akasha).