WavPack 3.93 Features:
completely free!
all new hybrid mode (provides high quality lossy + "correction" file)
perfect for archiving audio (16, 20, and 24-bit, mono or stereo)
easily the fastest program of its type, yet gives good compression
small, efficient executable (no large programs or dlls to install)
intuitive command line interface (with wildcards and destination directory)
selectable raw mode for any non-wav files (including CD image files)
seekable winamp plugin with ID3v1 support
fully backward compatible to WavPack 1.0
Windows frontend available
create self-extracting archives
32-bit error detection
http://www.wavpack.com
LPAC 1.41 Features:
-Totally lossless compression of 8 bit, 16 bit, 20 bit and 24 bit wave files (mono / stereo).
-Cross-platform support for Windows, Linux and Solaris.
-Direct playback of LPAC files (*.PAC) with Winamp plug-in.
-CRC checksum to ensure lossless processing (since codec 2.0).
-Encoding much faster than real time (4x - 12x on a 500 MHz Pentium).
LPAC Website