The author is indebted to the following people. OptiPNG would not exist without their work.

    Mark Adler              for developing the zlib library
    Thomas Boutell          for the idea of creating the PNG image format
                            (it's all his fault!)
    Jean-loup Gailly        for devising a patent-free deflation algorithm
                            and for developing the zlib library
    Phil Katz               for inventing ZIP (PKZip) and the deflation algorithm
    David Koblas            GIF support is derived from the giftopnm tool
    Miyasaka Masaru         BMP support is derived from the bmptopng tool
    David Salomon           for writing the most comprehensive data compression
                            reference book
    Jason Summers           image reductions are inspired from the pngrewrite tool
    Glenn Randers-Pehrson   OptiPNG is inspired from the pngcrush tool(!)
    The PNG Dev. Group      for developing the PNG format and the libpng library
                            and also for countless help via the emailing list :-)
    The Information Theory  Shannon, Huffman, Ziv, Lempel et al.,
    founding fathers        you will never be forgotten!

There are also many people who contributed to the OptiPNG project. The author is grateful to all of them.
If anyone is omitted from this list: please don't be shy and send an email!

    Peter Ahlstrom          for experimenting with the zlib parameters
                            and for providing useful test data
    [akJ]                   for writing an Eclipse RCP utility
    [amake]                 for writing pngcrusher, a Mac OS X front-end
    Fabrizio Bartoloni      for maintaining the MorphOS port
    Adam Ciarcinski         for maintaining the NetBSD port
    James H. Cloos, Jr.     for being the first to report a defect
    Andrew C. E. Dent       for experimenting with various compression parameters
                            and for providing useful test data
    Nicolas Le Gland        for reporting a defect
    Tero Grundström         for reporting a gcc-specific issue
    Larry Hastings          for suggesting a performance improvement,
                            for reporting a defect,
                            and for providing useful test data
    Max Horn                for maintaining the Mac OS X port
    Thomas Hurst            for maintaining the FreeBSD port
    Niels de Koning         for contributing memory leak fixes
    Vitaly Lipatov          for maintaining the ALT Linux port
    Nehal Mistry            for suggesting various features
    Nelson A. de Oliveira   for maintaining the Debian Linux port,
                            for contributing various scripts,
                            and for relaying defect reports
    Tavis Ormandy et al.    for maintaining the Gentoo Linux port (thx everyone!)
    Dimitri Papadopoulos    for reporting a defect
    Aaron Reitz             for reporting a defect
    Juhapekka Tolvanen      for suggesting various script improvements
    [warriant]              for suggesting the use of UPX to pack the executable
    Liang Zhao              for reporting a linker issue