Plogue has a released sforzando, a free SFZ and soundfont player for Mac & Windows.
sforzando is a free 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!
sforzando is also a name given for a sudden change in music dynamics which, in musical notation, is represented by the “sfz” symbol.
You can also drop SF2, DLS and acidized WAV files directly on the interface, and they will automatically get converted to SFZ 2.0, which you can then edit and tweak to your liking!
sforzando is available at no cost.
More info: sforzando by Plogue