Original concept and programming by Con Kolivas
Beginning with version 0.19, Peter Hyman submitted bug fixes,
patches, multi-threading support, assembler integration,
SDK updating, and autoconf improvements.

Andrew Tridgell for rzip.
Thanks to Markus Oberhumer for lzo.
Thanks to Igor Pavlov for lzma and CRC Assembler code. 
Thanks to Jean-loup Gailly and Mark Adler for the zlib 
compression library. 
Thanks to Christian Leber for lzma compat layer
Thanks to Lasse Collin for debugging the compat layer
Michael J Cohen for Darwin support
Jukka Laurila for newer Darwin support