Sforzando is a Free SFZ Player. Simple but Powerful For Advanced Users. 

Sforzando is a free, highly SFZ 2.0 compliant sample player. Advanced sample hobbyists now have a powerful tool to experiment and share instruments without relying on proprietary formats. sforzando only has one instrument slot; no fancy UI, effects or mixers. Every tweak needs to be done at the SFZ file level, no cheating! More here