A music player for Linux written in C#. Development stopped when I realised there were far better music players in existence and creating yet another one was a little silly.
I built Bluefunk in the early days of the Mono Project (which brought Microsoft’s dotnet runtime to Linux and was later acquired by Microsoft).
An archived screenshot of the site I created for this back in 2005.
The original is at https://bluefunk.sourceforge.net/.