I'm not up on N64 hacking/ripping myself ...but
N64 Graphics tool
A couple of game specific tools (Perfect Dark/Golden Eye)
There will prolly be more aswell besides but like I said I've not really looked into this before
From my quick dig though alot say there are not many tools for extracting files from N64 roms
Textures could maybe be easy though using one of the more general ROM graphics tools, most cover multi systems, so worth checking to find out if any cover N64 aswell as the other systems