SNESAmp
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SNESAmp is a Winamp input plugin used to play SPC sound files. It is (as of July 30, 2004) at version 3.2. It is currently being developed by "Anti Resonance" of Alpha-II Productions in C++ and x86 assembly using Borland C++ Builder 5.
The plugin is very configurable and presents a variety of features, including looping, high output sampling rates, realtime pitch & tempo controlling, *.rsn archive support, ID666 tag support, and ZSNES savestate audio playback support.
SNESAmp can even produce higher-quality output than the SPC700 itself by outputting the sound at a higher sampling rate and using more complex interpolation than the original SPC700's Gaussian interpolation (like cubic interpolation) and using the built-in special "High Quality" enhancement feature.