I suppose it is a bit strange to have a whole section dedicated to ninja swords. But hey, it is what it is. One could argue that all the weapons listed on this site are "ninja weapons" but lets not dig to deep into it. If your looking for ninja weapons, swords in particular a good site to check out is weapons universe. They have a number of different swords, nunchaku, and other ninja gear. I think that this is the best resource for a ninja section, because they explicitly state that their gear is ninja oriented.