Arc-Nova.org
All credibility, all good conscience, all evidence of truth come only from the senses.
Players
Audacious (Linux):
Supports all formats except 2SF, USF, KSS and WSR.
Audio Overload (Windows, Linux, Mac):
Supports all hosted formats except 2SF and USF.
ChipAmp Plugin Bundle for Winamp (Windows):
Gives full playback support for all hosted formats except the 2SFs, KSSes and WSRs. See below.
In_Vio2SF.dll (Windows):
A Winamp plugin that allows 2SF playback.
Vio2Play (Linux):
Standalone 2SF player.