Winamp development may be in limbo today, but I would never call it a failed product. It thrived very well, influenced a lot of future products, and also still lives with many users including me.

You can get a relatively recent beta for WinAmp. It was leaked online and the current owners of the software (Radionomy) chose to release the beta[1] following the leak so that people could download from an official source rather than resorting to piracy and grey-area download sites[2].

They claim to be working on a new version but, in the meantime, the leaked/released beta is a perfectly serviceable version of the software.

[1]: http://www.winamp.com/

[2]: https://en.wikipedia.org/wiki/Winamp#Winamp_5.8