OpenAMP Lite X is an open source continuation of the forgotten MacAMP Lite X by Subband Technologies.
MacAMP was originally an app for the Classic MacOS. Being that it predates WinAMP by a few months, it is the oldest MP3 player ever made. The app was created while the developers were still a part of Nullsoft, and in 1999 Subband Technologies was born after AOL bought Nullsoft. In 2002, the Mac OS X version of Lite was released. By early 2008, Subband Technologies and by extension the killer app of an MP3 player both disappeared, never to be seen again.
To compile it, you need Xcode 1.0 or newer installed for the command line tools and interface builder
gcc *.c -o OpenAMP