Boker, schrade OT (what you can still find out there), edge brand, boker (some), Case cv (cv was cases original blade material before surgical steel, and it is still used of course on a few, namely on amber bone, or yellow delrin, they also make some surgical ones in these materials, so make sure you buy the right ones, the cv is a carbon steel plated with chrome), buck creek, bulldog, camillus (makes a few in delkrin), cold steel makes a few tradtionals in their carbon v (I believe), queen makes some working knives in D2 (better than carbon steel, but harder to sharpen), kissing crane makes some (not many), Hen and rooster (use to, not sure if they do now).