Modern high-holding power anchors are often available in stainless steel as well as in regular steel with a galvanised finish, e.g. Rocna, Vulcan and Spade
Some of the older, tried-and-trusted designs are also available in stainless steel, notably the Lewmar Delta and the Claw, a variant of the original Bruce anchor.
Ultra Marine focuses their design and manufacturing efforts solely on stainless steel, undoubtedly leading the way in design, merit, and popularity. Ultra also provide a consummate flip swivel for connecting to the anchor chain.
Quick Olympic Anchors are a relatively new design, available in a choice of Satin or Bright Polished stainless steel finishes.
Mantus and Ankerplex produce excellent small versions for dinghies, dayboats and small yachts.
Please note that selecting an anchor that is purpose-designed in your preferred finish may be advisable due to the different strength and resistance properties of stainless and galvanised mild steel.
Stainless steel anchors are best deployed as part of a stainless steel chain anchor rode, but can often be observed at the end of a galvanised chain with a stainless steel connector. Galvanic corrosion must be considered, but the anchor should not be the affected component. Galvanised and Stainless Steel together