ZLIB
A Massively Spiffy Yet Delicately Unobtrusive Compression Library
(Also Free, Not to Mention Unencumbered by Patents)
zlib for Windows 9x/NT (version 1.1.4, DLL version, plus related utilities)
zlib for Windows 9x/NT (version 1.1.4, DLL and static version)
Mark Nelson's ZlibTool article and Win32 source code for Dr. Dobb's Journal (January 1997)
zlib C++ wrapper for the gz* functions.
zlib 32-bit OCX and 16-bit DLL (Visual Basic interface, source code and binaries, 84k)
zlib 32-bit OCX (C++ source and binaries for use with Visual Basic 4.x or Delphi 2.0)
(unsupported VB5 binary also available)
zlib Pascal port (version 1.1.2, Pascal source, tested with Turbo Pascal 7.0 and Delphi 3.02)
(not tested by us, but looks complete and well-maintained)
zlib Delphi 5 interface (update of contrib/delphi2 files)
(includes compiled object files and corresponding C++ Builder 5 project files)
zlib Perl interface (source code; look for Compress-Zlib*.tar.gz)
http://www.gzip.org/zlib/