dirogg is a small script to migrate your entire music collection to the Ogg Vorbis format. It's a recursive script, meaning that you run it from the root of your music collection, and it will automatically convert your MP3 files to Ogg Vorbis (ogg) files. If you wish, it can also remove your MP3 files after conversion.
Oggify is a program that was written to help manage and convert FLAC audio files into other formats. It ships with MP3 and Ogg Vorbis support. It is intended to allow a user to have a directory tree of FLAC files, and be able to update a tree of MP3 or Ogg files as they add new FLAC files. It has an easy command-line interface with a variety of adjustable settings. It also features a plugin architecture to make it easy to add support for more formats.