rubyPod is a graphical frontend for managing an iPod on Linux, relying on the gnuPod project as its backend.
It supports adding and deleting of songs, creation and modification of playlists, convenient id3v2 mp3 tag edition and exporting to hard drive.
Prcho is a Ruby on Rails-based online music player and organizer. Its design enables it to access extremely large music libraries with grace, finding songs quickly and streaming them all over the world.