Copyright © 1989-1994 The Regents of the University of California
Copyright © 1992-1999 Karl Lehenbauer & Mark Diekhans
Copyright © 1993-1997 Bell Labs Innovations for Lucent Technologies
Copyright © 1994-2000 Sun Microsystems, Inc
Copyright © 1997-2000 Ajuba Solutions
Copyright © 1998 Mark Harrison
Copyright © 1998-2000 Scriptics Corporation
Copyright © 2001 ActiveState Tool Corp
Copyright © 2001 Vincent Darley
Copyright © 2001-2004 ActiveState Corporation
Copyright © 2001-2018 Kevin B. Kenny <kennykb(at)acm.org>
Copyright © 2001-2023 Donal K. Fellows
Copyright © 2002-2010 Andreas Kupries <andreas_kupries(at)users.sourceforge.net>
Copyright © 2003 George Petasis <petasis(at)iit.demokritos.gr>
Copyright © 2003 Simon Geard
Copyright © 2005 Sergey Brester aka sebres
Copyright © 2006 Miguel Sofer
Copyright © 2006-2008 ActiveState Software Inc
Copyright © 2006-2008 Joe Mistachkin
Copyright © 2008 Pat Thoyts
Copyright © 2008 Peter Spjuth <pspjuth(at)users.sourceforge.net>
Copyright © 2009-2010 Kevin B. Kenny
Copyright © 2011-2015 Andreas Kupries
Copyright © 2012 Trevor Davel
Copyright © 2015 Christian Werner <chw(at)ch-werner.de>
Copyright © 2015 Jan Nijtmans <jan.nijtmans(at)gmail.com>
Copyright © 2015-2017 Sean Woods <yoda(at)etoyoc.com>
Copyright © 2017 Frederic Bonnet
Copyright © 2018 Peter Spjuth
Copyright © 2018 Tcl Core Team
Copyright © 2019 Donal Fellows
Copyright © 2022 Ashok P. Nadkarni <apnmbx-public(at)yahoo.com>
Copyright © 2022 Eric Taylor