Rage against the machine. I posted them earlier. Probably my favorite but not the first or the last
Disclaimer. Nu metal is not included in this discussion
But you got ice t's heavy metal band, body count
Run dmc and ll cool j if you want to go way back. I'd say public enemy is lowkey rock with their influence as well. Can't see there being a ratm without them. Beastie boys as well mixed hip hop, rock, and hardcore
Death grips is a more experimental group that mixes rap, rock, and noise
Bands like faith no more and the red hot Chilli peppers also had a strong rap influence on their early albums
I haven't listened to a lot of Linkin park but they're not bad. Zebrahead got some nice stuff too