<AHREF="http://sourceforge.net/projects/kexis">Kexis</A> - An open-source source codec. Development seems to have stopped at the alpha stage. No player or library support yet.
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<AHREF="http://www-ft.ee.tu-berlin.de/~liebchen/lpac.html">LPAC</A> - A closed source codec. At least it's available for more than just Windows, but there's only a Winamp plugin.
<AHREF="http://www.nue.tu-berlin.de/wer/liebchen/lpac.html">LPAC</A> - A closed source codec. At least it's available for more than just Windows, but there's only a Winamp plugin.
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<AHREF="http://www.monkeysaudio.com/">Monkey's Audio</A> - A symmetric adaptive codec with good compression. Source is available under a non-OSI license. There are two versions available now, one by the original author Matt Ashland and one by Frank Klemm. The one tested here is from the original author.