GogoL! 

Audio enhancement plugin for the most popular media players like Winamp, Sonique. GogoL! is designed to enhance the listening experience for users of Internet audio formats such as MP3, and Microsoft's Windows Media streaming format.
gogol audio mp3 streaming surround enhancement plugin plug-in media player winamp sonique sound fidelity

Ozone for Windows Media Player 9 

Analog modeled audio enhancement. Analog modeled EQ, tube compressors and amplifiers, room simulators and more -- a lot more.
winamp audio enhancer plug-in equalizer analog modeling

Ozone for Winamp 3 

Analog modeled audio enhancement. Analog modeled EQ, tube compressors and amplifiers, room simulators and more -- a lot more.
winamp audio enhancer plug-in equalizer analog modeling

Ozone for Winamp 2 

Analog modeled audio enhancement. Analog modeled EQ, tube compressors and amplifiers, room simulators and more -- a lot more.
winamp audio enhancer plug-in equalizer analog modeling