The Winamp Skin Museum is a custom user interface for the Internet Archive's collection of over 65,000 Winamp skins. ⠀ You can find the original collection here: https://archive.org/details/winampskins
Re:AMP is a fast, flexible, high-fidelity music player for macOS X, fully written in Swift. Re:Amp supports a lot of audio formats, custom interfaces called skins from classic Winamp. Re:Amp is freeware.