From Julius van der Werf:
Note,
the following are excel spreadsheets (often including a macro). They are
meant to help you get started if you are interested
I can not be held responsible for any commercial damage that you think
are the result of using these spreadsheets.
There is generally no help (except by email) and sheets and cells
are not fully protected.
I have not always spend the time to make them fully user's friendly. However,
I hope some of these can be useful for you
Comments welcome at: julius.vanderwerf@une.edu.au
The following have a lower degree of user friendliness
From Brian Kinghorn: