The authors for the main code in alphabetical order:

Bunkus, Moritz (Mosu) <moritz@bunkus.org>
    * Almost everything

Cannon, John (spyder482) <spyder@matroska.org>
    * MPEG ES parser code

Le Guen, Nicolas (Goldenear) <nleguen@pepper-prod.com>
    * Enhancements and updates to the "CUE sheet to tags & chapter
      conversion" process
    * Small updates to mmg and the MIME type list

Lhomme, Steve (robux4) <steve.lhomee@free.fr>
    * Fixes for compilation with MSVC
    * Enhancements and fixes to the XML chapter parser
    * The complete VobButton handling
    * The complete WAVPACK handling
    * Support for SimpleBlock usage

Matsnev, Mike (Haali) <mike@po.cs.msu.su>
    * CreateFileUtf8() function
    * Windows implementation for vsscanf
    * The MPEG header generation for VobSub extraction

Mistry, Shailesh L <shailesh.mistry@milan.eclipse.co.uk>
    * Fixes for compilation of avilib with cygwin

Niemayer, Peter <niemayer@isg.de>
    * The DTS code (reader, packetizers, dts_common)
    * The use of posix_fadvise in the mm_io_c class

Pettersen, Vegard <vegard_p@broadpark.no>
    * Extended support for converting CUE sheets to tags & chapters

Rice, Matt <topquark@sluggy.net>
    * Extraction of h.264 into proper h.264 ES streams

Stone, Jory (jcsston) <jcsston@toughguy.net>
    * Fixes to mkvinfo's GUI

?, ? (Lefungus)
    * Avoid several compiler warnings

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Stuff that was developped externally and only included/patched in mkvtoolnix:

avilib:
    * Johanni, Rainer <Rainer@Johanni.de> (original source code)
    * Östreich, Thomas <ostreich@theorie.physik.uni-goettingen.de>
      (lots of modifications in transcode)
    * Bunkus, Moritz <moritz@bunkus.org> (lots of modifications in
      ogmtools and mkvtoolnix)
    * probably others