License.txt

Until I find I prefer another.  Here is the GNU General Pulblic
License V3.0

I add one thing at the top.

If you us HGB in any published software.  Remark, in your "about":
Words with the same meaning but you may choose your own words:
"HGB was used to generate the hexagaons of this app"

--------------------------------------------------------------------------

                    GNU GENERAL PUBLIC LICENSE
                                           Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
   of this license document, but changing it is not allowed.

                            Preamble

  The GNU General Public License is a free, copyleft license for
  software and other kinds of works.

  The licenses for most software and other practical works are designed
  to take away your freedom to share and change the works.  By contrast,
  the GNU General Public License is intended to guarantee your freedom to
  share and change all versions of a program--to make sure it remains free
  software for all its users.  We, the Free Software Foundation, use the
  GNU General Public License for most of our software; it applies also to
  any other work released this way by its authors.  You can apply it to
  your programs, too.

  When we speak of free software, we are referring to freedom, not
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  To protect your rights, we need to prevent others from denying you
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  Developers that use the GNU GPL protect your rights with two steps:
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                       TERMS AND CONDITIONS

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  13. Use with the GNU Affero General Public License.

  Notwithstanding any other provision of this License, you have
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  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
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  If the Program specifies that a proxy can decide which future
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  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
  APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
  HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
  OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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  GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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  DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
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  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
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  reviewing courts shall apply local law that most closely approximates
  an absolute waiver of all civil liability in connection with the
  Program, unless a warranty or assumption of liability accompanies a
  copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
  possible use to the public, the best way to achieve this is to make it
  free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
  to attach them to the start of each source file to most effectively
  state the exclusion of warranty; and each file should have at least
  the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
        Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or
        modify it under the terms of the GNU General Public License as
        published by the Free Software Foundation, either version 3 of
        the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
        along with this program.  If not, see <https://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
  notice like this when it starts in an interactive mode:

    <program> Copyright (C) <year> <name of author> This program comes
        with ABSOLUTELY NO WARRANTY; for details type `show w'.  This
        is free software, and you are welcome to redistribute it under
        certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
  if any, to sign a "copyright disclaimer" for the program, if necessary.
  For more information on this, and how to apply and follow the GNU GPL, see
  <https://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
  into proprietary programs.  If your program is a subroutine library, you
  may consider it more useful to permit linking proprietary applications with
  the library.  If this is what you want to do, use the GNU Lesser General
  Public License instead of this License.  But first, please read
  <https://www.gnu.org/licenses/why-not-lgpl.html>.