Foobar2000 is free audio player.

Madsonic is a web-based media library and media streamer with jukebox functionality.

Sockso is a free, open-source, personal music host server.

AIMP is a free audio player with support for a large number of formats and playlists.

GetMp3! is an app for downloading music and videos that lets you search for any song and download the ones you like best with a single click.