Yesterday, the Winamp source code, build tools, and associated libraries for the Windows app were published on GitHub, allowing anyone to provide bug fixes and new features to the iconic media player.
However, its license prohibits the distribution of modified software created through the release of this source code.
https://github.com/WinampDesktop/winamp
I think there'd still be enough people nostalgic about it to make a LinAmp out of the code, but only if it was under a real open source license.