You want https://webamp.org/ https://webamp.org/ . There's also https://skins.webamp.org/ https://skins.webamp.org/, which, while looking at first glance like

You want https://webamp.org/ https://webamp.org/ . There's also https://skins.webamp.org/ https://skins.webamp.org/, which, while looking at first glance like an image gallery, actually loads each skin into the fully-interactive WebAmp client as a way of previewing the skin.