Bitrate

Gordian Knot started out as a simple bitrate calculator for DivX encoding but has evolved to become an integrated package or tool for the entire process of DivX/XviD encoding.

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Developer: gordianknot
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP)

mp3togo loads MP3, Ogg Vorbis, FLAC, and WAV files on to a portable MP3 player by decoding them (if required) and reencoding in a consistent lower bitrate MP3 (or Vorbis) format.

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Developer: Simeon Veldstra
License: GNU General Public License (GPL)
Operating System: Linux

Getid3() is multi-platform compatible.

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Developer: http://getid3.sourceforg...
License: Freeware
Operating System: Unix/Linux/Windows

MP3SPI adds MP3 audio format support to the Java Platform (J2SE).

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Developer: javazoom.net
License: Freeware
Operating System: All