XiX Music Player is a music player for MP3, Ogg, M4A, and FLAC files. It is easy to create and maintain your own playlists. There is an integrated lyric viewer that searches for the lyric of the song you are listening to. If the CD cover is found, it is also shown. You can also rip CD tracks to MP3 or FLAC. Listening to your favorite online radio stations is also possible. The focus is on having fast control of all your music.
wave-player is a remotely-controllable music player (frontend) connecting via HTTP calls to a music database (backend). It allows music to be controlled and streamed via HTTP so you can hear your music at work or anywhere else. The frontend is based on QT4 and the backend uses via Perl/MySQL. The API is open and REST-based.
Plgen (Playlist Generator) is a tool that sorts files for MP3 players in a user defined order. Cheap MP3 players often come with no playlist capabilities. In addition these players often make use of the FAT16/32 file system, leading to confusion when the playing order is not alphabetical on the device even though it is shown as alphabetical in the file explorer.