vorbis-tools contains an Ogg Vorbis command-line encoder,
decoder/player and a tool for changing .ogg file comments.  Ogg
Vorbis is a audio encoding format; its technology is patent-free and
players and encoders are available on a variety of operating
systems.
  * oggenc encodes audio into the Ogg Vorbis format
  * ogg123 plays Ogg Vorbis files or URLs streamed via HTTP
  * vorbiscomment can list or set comments in an .ogg file

Homepage:
http://www.vorbis.com/
