The following kind people have contributed to this debugger:

Eric Blake <ebb9 at byu dot edu> - packaging/build fixes. cygwin packaging
Manfred Tremmel <Manfred.Tremmel at iiv.de> - RPM building for SuSE
Masatake YAMATO <jet at gyve.org> - Emacs support, screenshots, progress meter
Matthias Klose <doko at cs dot tu-berlin dot de> - making build system and 
                                                   package more industrial 
                                                   strength.
Mikael Andersson  snikkt at telia dot com - "V" command auto* fixes
Oleksandr Moskalenko  <malex at tagancha dot org> Debian packaging
Matt Fleming          - NetBSD packaging
Alberto Griggio       - Annotate patch #1781965 (for pydb)

Some ideas from Kent Sibilev's ruby-debug have been encorporated into
this debugger. 

The O'Reilly book on the Korn shell by Bill Rosenblatt suggested that
it might be possible to write a debugger.

Thanks to Chet Ramey for continued support of bash and
adding/encorprating changes needed to support debugging better.

--

The following software is used in this debugger:

getopts_long.sh by Stéphane Chazelas - GNU-compatible long-options parsing
shunit2 by Kate Ward - unit tests