MediaMonkey
A Windows-based media file tagger & organizer, complete with a built-in media player. And CD ripper/burner (limited speed on free version). And Transcoding tool.
The media player can use most Winamp's input, output, DSP, and visualization plugins.
Unlike many media players, the user interface is themed as a media library.
The free version, is, well, free. The Gold version (which adds, among others, automatic/periodic scan of "watched folders") is 29.95 USD.
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