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History of DDD
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The history of DDD is a story of code recycling.  The oldest parts of
DDD were written in 1990, when _Andreas Zeller_ designed VSL, a
box-based visual structure language for visualizing data and program
structures.  The VSL interpreter and the Box library became part of
Andreas' Diploma Thesis, a graphical syntax editor based on the
Programming System Generator PSG.

   In 1992, the VSL and Box libraries were recycled for the NORA
project.  For NORA, an experimental inference-based software
development tool set, Andreas wrote a graph editor (based on VSL and
the Box libraries) and facilities for inter-process knowledge exchange.
Based on these tools, _Dorothea Lütkehaus_ (now _Dorothea Krabiell_)
realized DDD as her Diploma Thesis, 1994.

   The original DDD had no source window; this was added by Dorothea
during the winter of 1994-1995.  In the first quarter of 1995, finally,
Andreas completed DDD by adding command and execution windows,
extensions for DBX and remote debugging as well as configuration
support for several architectures.  Since then, Andreas has further
maintained and extended DDD, based on the comments and suggestions of
several DDD users around the world.  See the comments in the DDD source
for details.

   Major DDD events:

April, 1995
     DDD 0.9: First DDD beta release.

May, 1995
     DDD 1.0: First public DDD release.

December, 1995
     DDD 1.4: Machine-level debugging, glyphs, Emacs integration.

October, 1996
     DDD 2.0: Color displays, XDB support, generic DBX support, command
     tool.

May, 1997
     DDD 2.1: Alias detection, button tips, status displays.

November, 1997
     DDD 2.2: Sessions, display shortcuts.

June, 1998
     DDD 3.0: Icon tool bar, Java support, JDB support.

December, 1998
     DDD 3.1: Data plotting, Perl support, Python support, Undo/Redo.

January, 2000
     DDD 3.2: New manual, Readline support, Ladebug support.

January, 2001
     DDD 3.3: Data themes, JDB 1.2 support, VxWorks support.

November, 2002
     DDD 3.3.2: Bash support.

March, 2003
     DDD 3.3.3: Better Bash support. Compiles using modern tools thanks
     to Daniel Schepler.

Dec, 2005
     DDD 3.3.12-test: GNU Make support added.

Feb, 2006
     DDD 3.3.12-test3: Modernize Python debugging

Feb, 2009
     DDD 3.3.12: First mainstream release to include improved support
     for Python, Bash and Make.