Author of ngrep:

    Jordan Ritter <jpr5@darkridge.com>

Use of couch whilst conceiving of the concept:

    Dave Goldsmith <daveg@atstake.com>  and
    Window Snyder <ws@atstake.com>

Original (old) porting of ngrep to Win32:

    Mike <mike@datanerds.com>

64-bit clean regex.c patch:

    Jeff <yaway@hotmail.com>

Hexdump patch:

    Andrew W. Flury <aflury@nas.nasa.gov>

Elite ideas and loads of licensing advice:

     Dan Frasnelli <dfrasnel@corewar.com>  and
     cstone <cstone@pobox.com>

Use of OSF/1 box and DDoS research:

     Dave Dittrich <dittrich@cac.washington.edu>

Compilation patches:

     dugsong <dugsong@monkey.org>
     Joerg Dorchain <jd@europeonline.net>

Tokenring Patch

     vacuum <vacuum@technotronic.com>

HPUX and Config Updates Patch

     Kevin Steves <stevesk@sweden.hp.com>

AIX patch

    "Joseph N. Wilson" <jnw@cise.ufl.edu>

TCP ECN patch

    Maik Pfeil <root@bundesspionageministerium.de>

Real RPM Packaging

    Dag Wieers <dag@wieers.com>

Excellent patch for adding IPv6 support to ngrep

    Bernard Massot <bmassot@users.sourceforge.net>

Assistance with IPv6 testing

    Ralph Logan
    Arrigo Triulzi

Timestamp diff from first match patch

    Joseph Heenan <jonu@users.sourceforge.net>

And many others.
