Welp_im_damnedPlex's Winamp-inspired music player Plexamp is now free | TechCrunch
I use Jellyfin - music, shows, movies... it's open-source and has a lot of features Plex doesn't. Including, not having to create an account. It's your's to do what you want.
Actually there is a Jellyamp which works with Jellyfin although not as feature complete as Plexamp