Then there are the plastic hooks. Also Sail hooks are plastic. I am not sure about the availability of these. The larger hooks are almost a category in themselves. There are now L, M, N, O, P, Q and S hooks.
Most manufacturers now make at least a few of the larger hooks.
I haven't seen an R one yet though. These are long hooks in large sizes. I haven't tried them yet but hope to one day. They are color coded. Another new hook is the cro-hook, which has hooks on both ends.