Have you searched on sourceforge.net?
There may be a solution there, or something close enough that it will
take little modification to make it work. You may not necessarily find
a _mac_ based solution, but you may find a web-based solution, for
example one that uses Apache, MySQL, and is written in PHP, Python,
Perl or Ruby. All of that runs on your Mac (if it's running OS X).
You can set up the Apache web server so that it serves the application
pages only to the mac its running on, this makes it closed from the
internet.
The developers of such a project may even be willing to take pay to
customize it for your needs. Since the projects are open source, you
will be able to hire someone to modify it for you, possibly at much
lower cost than you fear, depending on the extent of the modifications.
Good luck.
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